-13=7+z

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Solution for -13=7+z equation: 



-13=7+z

We move all terms to the left:

-13-(7+z)=0

We add all the numbers together, and all the variables

-(z+7)-13=0

We get rid of parentheses

-z-7-13=0

We add all the numbers together, and all the variables

-1z-20=0

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

-z=20

z=20/-1

z=-20

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