-15b+21=-5b-19

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Solution for -15b+21=-5b-19 equation: 



-15b+21=-5b-19

We move all terms to the left:

-15b+21-(-5b-19)=0

We get rid of parentheses

-15b+5b+19+21=0

We add all the numbers together, and all the variables

-10b+40=0

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

-10b=-40

b=-40/-10

b=+4

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