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b+311=-7b+7
We move all terms to the left:
b+311-(-7b+7)=0
We get rid of parentheses
b+7b-7+311=0
We add all the numbers together, and all the variables
8b+304=0
We move all terms containing b to the left, all other terms to the right
8b=-304
b=-304/8
b=-38
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