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-8b+7+6b=-3+12
We move all terms to the left:
-8b+7+6b-(-3+12)=0
We add all the numbers together, and all the variables
-8b+6b+7-9=0
We add all the numbers together, and all the variables
-2b-2=0
We move all terms containing b to the left, all other terms to the right
-2b=2
b=2/-2
b=-1
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