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27=2b-15
We move all terms to the left:
27-(2b-15)=0
We get rid of parentheses
-2b+15+27=0
We add all the numbers together, and all the variables
-2b+42=0
We move all terms containing b to the left, all other terms to the right
-2b=-42
b=-42/-2
b=+21
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