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90+(2b-90)+1.5b+b+45+b=540

We move all terms to the left:

90+(2b-90)+1.5b+b+45+b-(540)=0

We add all the numbers together, and all the variables

3.5b+(2b-90)-405=0

We get rid of parentheses

3.5b+2b-90-405=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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