15=-3(b+60)

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Solution for 15=-3(b+60) equation: 



15=-3(b+60)

We move all terms to the left:

15-(-3(b+60))=0



We calculate terms in parentheses: -(-3(b+60)), so:

-3(b+60)

We multiply parentheses

-3b-180

Back to the equation:

-(-3b-180)



We get rid of parentheses

3b+180+15=0

We add all the numbers together, and all the variables

3b+195=0

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

3b=-195

b=-195/3

b=-65

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