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(b-40/5)+b+2(b-40/5)=180
We move all terms to the left:
(b-40/5)+b+2(b-40/5)-(180)=0
We add all the numbers together, and all the variables
(b-8)+b+2(b-8)-180=0
We add all the numbers together, and all the variables
b+(b-8)+2(b-8)-180=0
We multiply parentheses
b+(b-8)+2b-16-180=0
We get rid of parentheses
b+b+2b-8-16-180=0
We add all the numbers together, and all the variables
4b-204=0
We move all terms containing b to the left, all other terms to the right
4b=204
b=204/4
b=51
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