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8a-2=4a+15
We move all terms to the left:
8a-2-(4a+15)=0
We get rid of parentheses
8a-4a-15-2=0
We add all the numbers together, and all the variables
4a-17=0
We move all terms containing a to the left, all other terms to the right
4a=17
a=17/4
a=4+1/4
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