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