13=z+-2

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Solution for 13=z+-2 equation: 



13=z+-2

We move all terms to the left:

13-(z+-2)=0

We add all the numbers together, and all the variables

-(z-2)+13=0

We get rid of parentheses

-z+2+13=0

We add all the numbers together, and all the variables

-1z+15=0

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

-z=-15

z=-15/-1

z=+15

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