-3(b+20)=-15

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Solution for -3(b+20)=-15 equation: 



-3(b+20)=-15

We move all terms to the left:

-3(b+20)-(-15)=0

We add all the numbers together, and all the variables

-3(b+20)+15=0

We multiply parentheses

-3b-60+15=0

We add all the numbers together, and all the variables

-3b-45=0

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

-3b=45

b=45/-3

b=-15

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