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-12+8a=2+4a+6a
We move all terms to the left:
-12+8a-(2+4a+6a)=0
We add all the numbers together, and all the variables
8a-(10a+2)-12=0
We get rid of parentheses
8a-10a-2-12=0
We add all the numbers together, and all the variables
-2a-14=0
We move all terms containing a to the left, all other terms to the right
-2a=14
a=14/-2
a=-7
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