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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
-9a-15=0
We move all terms containing a to the left, all other terms to the right
-9a=15
a=15/-9
a=-1+2/3
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