b+8=2b-4

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Solution for b+8=2b-4 equation: 



b+8=2b-4

We move all terms to the left:

b+8-(2b-4)=0

We get rid of parentheses

b-2b+4+8=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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