20=7z-15

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Solution for 20=7z-15 equation: 



20=7z-15

We move all terms to the left:

20-(7z-15)=0

We get rid of parentheses

-7z+15+20=0

We add all the numbers together, and all the variables

-7z+35=0

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

-7z=-35

z=-35/-7

z=+5

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