-2b=b-7-8

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Solution for -2b=b-7-8 equation: 



-2b=b-7-8

We move all terms to the left:

-2b-(b-7-8)=0

We add all the numbers together, and all the variables

-2b-(b-15)=0

We get rid of parentheses

-2b-b+15=0

We add all the numbers together, and all the variables

-3b+15=0

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

-3b=-15

b=-15/-3

b=+5

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