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-15-3b=-6b+6
We move all terms to the left:
-15-3b-(-6b+6)=0
We get rid of parentheses
-3b+6b-6-15=0
We add all the numbers together, and all the variables
3b-21=0
We move all terms containing b to the left, all other terms to the right
3b=21
b=21/3
b=7
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