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-16=-7b+12
We move all terms to the left:
-16-(-7b+12)=0
We get rid of parentheses
7b-12-16=0
We add all the numbers together, and all the variables
7b-28=0
We move all terms containing b to the left, all other terms to the right
7b=28
b=28/7
b=4
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