-9+13=x

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Solution for -9+13=x equation: 



-9+13=x

We move all terms to the left:

-9+13-(x)=0

We add all the numbers together, and all the variables

-1x+4=0

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

-x=-4

x=-4/-1

x=+4

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