15=-5(10+b)

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Solution for 15=-5(10+b) equation: 



15=-5(10+b)

We move all terms to the left:

15-(-5(10+b))=0

We add all the numbers together, and all the variables

-(-5(b+10))+15=0



We calculate terms in parentheses: -(-5(b+10)), so:

-5(b+10)

We multiply parentheses

-5b-50

Back to the equation:

-(-5b-50)



We get rid of parentheses

5b+50+15=0

We add all the numbers together, and all the variables

5b+65=0

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

5b=-65

b=-65/5

b=-13

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