3b-7b=12

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Solution for 3b-7b=12 equation: 



3b-7b=12

We move all terms to the left:

3b-7b-(12)=0

We add all the numbers together, and all the variables

-4b-12=0

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

-4b=12

b=12/-4

b=-3

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