13-x=-20

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Solution for 13-x=-20 equation: 



13-x=-20

We move all terms to the left:

13-x-(-20)=0

We add all the numbers together, and all the variables

-1x+33=0

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

-x=-33

x=-33/-1

x=+33

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