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7a+4=3a-2-6
We move all terms to the left:
7a+4-(3a-2-6)=0
We add all the numbers together, and all the variables
7a-(3a-8)+4=0
We get rid of parentheses
7a-3a+8+4=0
We add all the numbers together, and all the variables
4a+12=0
We move all terms containing a to the left, all other terms to the right
4a=-12
a=-12/4
a=-3
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