3-7b=87

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Solution for 3-7b=87 equation: 



3-7b=87

We move all terms to the left:

3-7b-(87)=0

We add all the numbers together, and all the variables

-7b-84=0

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

-7b=84

b=84/-7

b=-12

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