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-49=-6b-7
We move all terms to the left:
-49-(-6b-7)=0
We get rid of parentheses
6b+7-49=0
We add all the numbers together, and all the variables
6b-42=0
We move all terms containing b to the left, all other terms to the right
6b=42
b=42/6
b=7
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