-15b+21+5b=-9

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Solution for -15b+21+5b=-9 equation: 



-15b+21+5b=-9

We move all terms to the left:

-15b+21+5b-(-9)=0

We add all the numbers together, and all the variables

-10b+30=0

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

-10b=-30

b=-30/-10

b=+3

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