-13=15-x

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Solution for -13=15-x equation: 



-13=15-x

We move all terms to the left:

-13-(15-x)=0

We add all the numbers together, and all the variables

-(-1x+15)-13=0

We get rid of parentheses

1x-15-13=0

We add all the numbers together, and all the variables

x-28=0

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

x=28

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