Question 671513
7{{{1/5}}}
-3{{{3/4}}}
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...
7{{{(1/5)(4/4)}}}
-3{{{(3/4)(5/5)}}}
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7{{{4/20}}}
-3{{{15/20}}}
_________________
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{{{6cross(7)}}}{{{(4/20)+(20/20)}}}
-3{{{15/20}}}
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6{{{24/20}}}
-3{{{15/20}}}
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3{{{9/20}}}
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Alternatively, change each mixed fraction into an improper fraction
7{{{1/5}}} = 5*s=35+1=36, so {{{36/5}}}
3{{{3/4}}} = 4*3=12+3=15, so {{{15/4}}}
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{{{36/5 - 15/4 = (36/5)(4/4) - (15/4)(5/5) = 144/20 - 75/20 = 69/20}}}
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Convert back into a mixed number
20 goes into 69 evenly 3 times, with 9 left over
3{{{9/20}}}
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