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-10=b/15-9
We move all terms to the left:
-10-(b/15-9)=0
We get rid of parentheses
-b/15+9-10=0
We multiply all the terms by the denominator
-b+9*15-10*15=0
We add all the numbers together, and all the variables
-1b-15=0
We move all terms containing b to the left, all other terms to the right
-b=15
b=15/-1
b=-15
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