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-4=10a+12-2a
We move all terms to the left:
-4-(10a+12-2a)=0
We add all the numbers together, and all the variables
-(8a+12)-4=0
We get rid of parentheses
-8a-12-4=0
We add all the numbers together, and all the variables
-8a-16=0
We move all terms containing a to the left, all other terms to the right
-8a=16
a=16/-8
a=-2
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