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-1+7b=10b-7
We move all terms to the left:
-1+7b-(10b-7)=0
We get rid of parentheses
7b-10b+7-1=0
We add all the numbers together, and all the variables
-3b+6=0
We move all terms containing b to the left, all other terms to the right
-3b=-6
b=-6/-3
b=+2
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