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1.50b+(b+45)+90+(2b+90)+b=540
We move all terms to the left:
1.50b+(b+45)+90+(2b+90)+b-(540)=0
We add all the numbers together, and all the variables
2.5b+(b+45)+(2b+90)-450=0
We get rid of parentheses
2.5b+b+2b+45+90-450=0
We add all the numbers together, and all the variables
5.5b-315=0
We move all terms containing b to the left, all other terms to the right
5.5b=315
b=315/5.5
b=57+1/3.6666666666667
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