-8=20+7z

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Solution for -8=20+7z equation: 



-8=20+7z

We move all terms to the left:

-8-(20+7z)=0

We add all the numbers together, and all the variables

-(7z+20)-8=0

We get rid of parentheses

-7z-20-8=0

We add all the numbers together, and all the variables

-7z-28=0

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

-7z=28

z=28/-7

z=-4

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