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-56.76=13.2b
We move all terms to the left:
-56.76-(13.2b)=0
We add all the numbers together, and all the variables
-(+13.2b)-56.76=0
We get rid of parentheses
-13.2b-56.76=0
We move all terms containing b to the left, all other terms to the right
-13.2b=56.76
b=56.76/-13.2
b=-4+2.0204081632653/6.734693877551
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