7b-8b=-12

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Solution for 7b-8b=-12 equation: 



7b-8b=-12

We move all terms to the left:

7b-8b-(-12)=0

We add all the numbers together, and all the variables

-1b+12=0

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

-b=-12

b=-12/-1

b=+12

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