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

-(x+15)+13=0

We get rid of parentheses

-x-15+13=0

We add all the numbers together, and all the variables

-1x-2=0

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

-x=2

x=2/-1

x=-2

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