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(9b+20)+7b+7b=180
We move all terms to the left:
(9b+20)+7b+7b-(180)=0
We add all the numbers together, and all the variables
14b+(9b+20)-180=0
We get rid of parentheses
14b+9b+20-180=0
We add all the numbers together, and all the variables
23b-160=0
We move all terms containing b to the left, all other terms to the right
23b=160
b=160/23
b=6+22/23
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