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-25=-3a+4a
We move all terms to the left:
-25-(-3a+4a)=0
We add all the numbers together, and all the variables
-(+a)-25=0
We get rid of parentheses
-a-25=0
We add all the numbers together, and all the variables
-1a-25=0
We move all terms containing a to the left, all other terms to the right
-a=25
a=25/-1
a=-25
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