13-x-x=-1

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Solution for 13-x-x=-1 equation: 



13-x-x=-1

We move all terms to the left:

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

We add all the numbers together, and all the variables

-2x+14=0

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

-2x=-14

x=-14/-2

x=+7

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