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-4=a/12
We move all terms to the left:
-4-(a/12)=0
We add all the numbers together, and all the variables
-(+a/12)-4=0
We get rid of parentheses
-a/12-4=0
We multiply all the terms by the denominator
-a-4*12=0
We add all the numbers together, and all the variables
-1a-48=0
We move all terms containing a to the left, all other terms to the right
-a=48
a=48/-1
a=-48
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