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(4b-17)+(4b+45)=180
We move all terms to the left:
(4b-17)+(4b+45)-(180)=0
We get rid of parentheses
4b+4b-17+45-180=0
We add all the numbers together, and all the variables
8b-152=0
We move all terms containing b to the left, all other terms to the right
8b=152
b=152/8
b=19
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