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90+1b+45+1b+3b/2+2b-90=540
We move all terms to the left:
90+1b+45+1b+3b/2+2b-90-(540)=0
We add all the numbers together, and all the variables
4b+3b/2-495=0
We multiply all the terms by the denominator
4b*2+3b-495*2=0
We add all the numbers together, and all the variables
3b+4b*2-990=0
Wy multiply elements
3b+8b-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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