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2a-12=6+4a
We move all terms to the left:
2a-12-(6+4a)=0
We add all the numbers together, and all the variables
2a-(4a+6)-12=0
We get rid of parentheses
2a-4a-6-12=0
We add all the numbers together, and all the variables
-2a-18=0
We move all terms containing a to the left, all other terms to the right
-2a=18
a=18/-2
a=-9
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