15=b+(-15)

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



15=b+(-15)

We move all terms to the left:

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



We calculate terms in parentheses: -(b+(-15)), so:

b+(-15)

We add all the numbers together, and all the variables

b-15

Back to the equation:

-(b-15)



We get rid of parentheses

-b+15+15=0

We add all the numbers together, and all the variables

-1b+30=0

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

-b=-30

b=-30/-1

b=+30

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