Question 470797
Checking -3: 

<table cellspacing=30><tr><td>-3</td><td>|</td><td>4</td><td>37</td><td>6</td><td>-27</td></tr><tr><td>&nbsp;</td><td>|</td><td>&nbsp;</td><td>-12</td><td>-75</td><td>207</td></tr><tr><td>&nbsp;</td><th COLSPAN=5>--------------------------------------</th></tr><tr><td>&nbsp;</td><td>&nbsp;</td><td>4</td><td>25</td><td>-69</td><td>180</td></tr></table>


Since the last entry in the last row is NOT a 0, -3 is NOT a zero


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Checking 5:



<table cellspacing=30><tr><td>5</td><td>|</td><td>4</td><td>37</td><td>6</td><td>-27</td></tr><tr><td>&nbsp;</td><td>|</td><td>&nbsp;</td><td>20</td><td>285</td><td>1455</td></tr><tr><td>&nbsp;</td><th COLSPAN=5>--------------------------------------</th></tr><tr><td>&nbsp;</td><td>&nbsp;</td><td>4</td><td>57</td><td>291</td><td>1428</td></tr></table>


Since the last entry in the last row is NOT a 0, 5 is NOT a zero



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Checking -8:


<table cellspacing=30><tr><td>-8</td><td>|</td><td>4</td><td>37</td><td>6</td><td>-27</td></tr><tr><td>&nbsp;</td><td>|</td><td>&nbsp;</td><td>-32</td><td>-40</td><td>272</td></tr><tr><td>&nbsp;</td><th COLSPAN=5>--------------------------------------</th></tr><tr><td>&nbsp;</td><td>&nbsp;</td><td>4</td><td>5</td><td>-34</td><td>245</td></tr></table>


Since the last entry in the last row is NOT a 0, -8 is NOT a zero

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Checking 8:



<table cellspacing=30><tr><td>8</td><td>|</td><td>4</td><td>37</td><td>6</td><td>-27</td></tr><tr><td>&nbsp;</td><td>|</td><td>&nbsp;</td><td>32</td><td>552</td><td>4464</td></tr><tr><td>&nbsp;</td><th COLSPAN=5>--------------------------------------</th></tr><tr><td>&nbsp;</td><td>&nbsp;</td><td>4</td><td>69</td><td>558</td><td>4437</td></tr></table>


Since the last entry in the last row is NOT a 0, 8 is NOT a zero

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Checking -4:




<table cellspacing=30><tr><td>-4</td><td>|</td><td>4</td><td>37</td><td>6</td><td>-27</td></tr><tr><td>&nbsp;</td><td>|</td><td>&nbsp;</td><td>-16</td><td>-84</td><td>312</td></tr><tr><td>&nbsp;</td><th COLSPAN=5>--------------------------------------</th></tr><tr><td>&nbsp;</td><td>&nbsp;</td><td>4</td><td>21</td><td>-78</td><td>285</td></tr></table>


Since the last entry in the last row is NOT a 0, -4 is NOT a zero