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