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3b/2+b+(b+45)+(2b-90)+90=540
We move all terms to the left:
3b/2+b+(b+45)+(2b-90)+90-(540)=0
We add all the numbers together, and all the variables
b+3b/2+(b+45)+(2b-90)-450=0
We get rid of parentheses
b+3b/2+b+2b+45-90-450=0
We multiply all the terms by the denominator
b*2+3b+b*2+2b*2+45*2-90*2-450*2=0
We add all the numbers together, and all the variables
3b+b*2+b*2+2b*2-990=0
Wy multiply elements
3b+2b+2b+4b-990=0
We add all the numbers together, and all the variables
11b-990=0
We move all terms containing b to the left, all other terms to the right
11b=990
b=990/11
b=90
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