7b+4b=7b-12

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Solution for 7b+4b=7b-12 equation: 



7b+4b=7b-12

We move all terms to the left:

7b+4b-(7b-12)=0

We add all the numbers together, and all the variables

11b-(7b-12)=0

We get rid of parentheses

11b-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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