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27=15a-7
We move all terms to the left:
27-(15a-7)=0
We get rid of parentheses
-15a+7+27=0
We add all the numbers together, and all the variables
-15a+34=0
We move all terms containing a to the left, all other terms to the right
-15a=-34
a=-34/-15
a=2+4/15
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