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-15=-4b+15
We move all terms to the left:
-15-(-4b+15)=0
We get rid of parentheses
4b-15-15=0
We add all the numbers together, and all the variables
4b-30=0
We move all terms containing b to the left, all other terms to the right
4b=30
b=30/4
b=7+1/2
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