b+7b=15

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Solution for b+7b=15 equation: 



b+7b=15

We move all terms to the left:

b+7b-(15)=0

We add all the numbers together, and all the variables

8b-15=0

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

8b=15

b=15/8

b=1+7/8

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