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7a-3=2a+12=
We move all terms to the left:
7a-3-(2a+12)=0
We get rid of parentheses
7a-2a-12-3=0
We add all the numbers together, and all the variables
5a-15=0
We move all terms containing a to the left, all other terms to the right
5a=15
a=15/5
a=3
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