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b-154=-4b-9
We move all terms to the left:
b-154-(-4b-9)=0
We get rid of parentheses
b+4b+9-154=0
We add all the numbers together, and all the variables
5b-145=0
We move all terms containing b to the left, all other terms to the right
5b=145
b=145/5
b=29
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