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(b-15)+3b+(2b+45)=360
We move all terms to the left:
(b-15)+3b+(2b+45)-(360)=0
We add all the numbers together, and all the variables
3b+(b-15)+(2b+45)-360=0
We get rid of parentheses
3b+b+2b-15+45-360=0
We add all the numbers together, and all the variables
6b-330=0
We move all terms containing b to the left, all other terms to the right
6b=330
b=330/6
b=55
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