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27=15a-(1)
We move all terms to the left:
27-(15a-(1))=0
We get rid of parentheses
-15a+1+27=0
We add all the numbers together, and all the variables
-15a+28=0
We move all terms containing a to the left, all other terms to the right
-15a=-28
a=-28/-15
a=1+13/15
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