13=x+(-15)

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Solution for 13=x+(-15) equation: 



13=x+(-15)

We move all terms to the left:

13-(x+(-15))=0



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

x+(-15)

We add all the numbers together, and all the variables

x-15

Back to the equation:

-(x-15)



We get rid of parentheses

-x+15+13=0

We add all the numbers together, and all the variables

-1x+28=0

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

-x=-28

x=-28/-1

x=+28

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