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-12=-32+4a
We move all terms to the left:
-12-(-32+4a)=0
We add all the numbers together, and all the variables
-(4a-32)-12=0
We get rid of parentheses
-4a+32-12=0
We add all the numbers together, and all the variables
-4a+20=0
We move all terms containing a to the left, all other terms to the right
-4a=-20
a=-20/-4
a=+5
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