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-1=-7+b/15
We move all terms to the left:
-1-(-7+b/15)=0
We add all the numbers together, and all the variables
-(b/15-7)-1=0
We get rid of parentheses
-b/15+7-1=0
We multiply all the terms by the denominator
-b+7*15-1*15=0
We add all the numbers together, and all the variables
-1b+90=0
We move all terms containing b to the left, all other terms to the right
-b=-90
b=-90/-1
b=+90
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