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5b-1=90-2b
We move all terms to the left:
5b-1-(90-2b)=0
We add all the numbers together, and all the variables
5b-(-2b+90)-1=0
We get rid of parentheses
5b+2b-90-1=0
We add all the numbers together, and all the variables
7b-91=0
We move all terms containing b to the left, all other terms to the right
7b=91
b=91/7
b=13
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