Question 1062479
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Subtract -3x-3y+4z from 9x-4y-5z<pre>Just like when you are told</pre>Subtract 4 from 10.<pre>You put down the second one, 10, than a minus sign, 
and then the first one, 4, like this:

10-4

and then simplify to get 6.  

So when you are told<pre>Subtract (-3x-3y+4z) from (9x-4y-5z)</pre>(after putting parentheses around them)
You put down the second one, (9x-4y-5z), than a minus sign, 
and then the first one, (-3x-3y+4z), like this:
(9x-4y-5z)-(-3x-3y+4z)
Now you simplify by first removing the parentheses,
remembering that when a parentheses is preceded by
a + you just erase the parentheses, but when a
parentheses is preceded by a - you nust change the
sign of every term inside when you erase the
parentheses:
9x-4y-5z+3x+3y-4z
Then you combine like terms:
           9x and +3x to get 12x
          -4y and +3y to get -1y or just -y
          -5z and -4z to get -9z
So the final answer is
12x-y-9z
Edwin</pre></b></font>