-15=5+z

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Solution for -15=5+z equation: 



-15=5+z

We move all terms to the left:

-15-(5+z)=0

We add all the numbers together, and all the variables

-(z+5)-15=0

We get rid of parentheses

-z-5-15=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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