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-37=-12+a
We move all terms to the left:
-37-(-12+a)=0
We add all the numbers together, and all the variables
-(a-12)-37=0
We get rid of parentheses
-a+12-37=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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