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3b+7=-4b
We move all terms to the left:
3b+7-(-4b)=0
We get rid of parentheses
3b+4b+7=0
We add all the numbers together, and all the variables
7b+7=0
We move all terms containing b to the left, all other terms to the right
7b=-7
b=-7/7
b=-1
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