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b+1.5b+b+2b+45-90+90=540
We move all terms to the left:
b+1.5b+b+2b+45-90+90-(540)=0
We add all the numbers together, and all the variables
5.5b-495=0
We move all terms containing b to the left, all other terms to the right
5.5b=495
b=495/5.5
b=90
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