-3z=20+z

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Solution for -3z=20+z equation: 



-3z=20+z

We move all terms to the left:

-3z-(20+z)=0

We add all the numbers together, and all the variables

-3z-(z+20)=0

We get rid of parentheses

-3z-z-20=0

We add all the numbers together, and all the variables

-4z-20=0

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

-4z=20

z=20/-4

z=-5

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