20=7z-2z

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Solution for 20=7z-2z equation: 



20=7z-2z

We move all terms to the left:

20-(7z-2z)=0

We add all the numbers together, and all the variables

-(+5z)+20=0

We get rid of parentheses

-5z+20=0

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

-5z=-20

z=-20/-5

z=+4

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