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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