-13=15+4z

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Solution for -13=15+4z equation: 



-13=15+4z

We move all terms to the left:

-13-(15+4z)=0

We add all the numbers together, and all the variables

-(4z+15)-13=0

We get rid of parentheses

-4z-15-13=0

We add all the numbers together, and all the variables

-4z-28=0

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

-4z=28

z=28/-4

z=-7

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