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8=12a-5.a
We move all terms to the left:
8-(12a-5.a)=0
We add all the numbers together, and all the variables
-(+7a)+8=0
We get rid of parentheses
-7a+8=0
We move all terms containing a to the left, all other terms to the right
-7a=-8
a=-8/-7
a=1+1/7
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