b+b=-7

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Solution for b+b=-7 equation: 



b+b=-7

We move all terms to the left:

b+b-(-7)=0

We add all the numbers together, and all the variables

2b+7=0

We move all terms containing b to the left, all other terms to the right

2b=-7

b=-7/2

b=-3+1/2

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