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7a+8=3a+12
We move all terms to the left:
7a+8-(3a+12)=0
We get rid of parentheses
7a-3a-12+8=0
We add all the numbers together, and all the variables
4a-4=0
We move all terms containing a to the left, all other terms to the right
4a=4
a=4/4
a=1
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