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2b-90+90+b+45+1.5+b=540
We move all terms to the left:
2b-90+90+b+45+1.5+b-(540)=0
We add all the numbers together, and all the variables
4b-493.5=0
We move all terms containing b to the left, all other terms to the right
4b=493.5
b=493.5/4
b=123+1/2.66666666667
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