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3=8a-15
We move all terms to the left:
3-(8a-15)=0
We get rid of parentheses
-8a+15+3=0
We add all the numbers together, and all the variables
-8a+18=0
We move all terms containing a to the left, all other terms to the right
-8a=-18
a=-18/-8
a=2+1/4
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