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(3b-7)+(4b+5)=180
We move all terms to the left:
(3b-7)+(4b+5)-(180)=0
We get rid of parentheses
3b+4b-7+5-180=0
We add all the numbers together, and all the variables
7b-182=0
We move all terms containing b to the left, all other terms to the right
7b=182
b=182/7
b=26
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