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27=1b-63
We move all terms to the left:
27-(1b-63)=0
We add all the numbers together, and all the variables
-(b-63)+27=0
We get rid of parentheses
-b+63+27=0
We add all the numbers together, and all the variables
-1b+90=0
We move all terms containing b to the left, all other terms to the right
-b=-90
b=-90/-1
b=+90
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