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6a-25=8a+12
We move all terms to the left:
6a-25-(8a+12)=0
We get rid of parentheses
6a-8a-12-25=0
We add all the numbers together, and all the variables
-2a-37=0
We move all terms containing a to the left, all other terms to the right
-2a=37
a=37/-2
a=-18+1/2
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