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(6b-21)+(5b-52)=180
We move all terms to the left:
(6b-21)+(5b-52)-(180)=0
We get rid of parentheses
6b+5b-21-52-180=0
We add all the numbers together, and all the variables
11b-253=0
We move all terms containing b to the left, all other terms to the right
11b=253
b=253/11
b=23
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