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9b=-15+8b
We move all terms to the left:
9b-(-15+8b)=0
We add all the numbers together, and all the variables
9b-(8b-15)=0
We get rid of parentheses
9b-8b+15=0
We add all the numbers together, and all the variables
b+15=0
We move all terms containing b to the left, all other terms to the right
b=-15
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