-15=-9b+6b

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Solution for -15=-9b+6b equation: 



-15=-9b+6b

We move all terms to the left:

-15-(-9b+6b)=0

We add all the numbers together, and all the variables

-(-3b)-15=0

We get rid of parentheses

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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