7-7z=-28

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Solution for 7-7z=-28 equation: 



7-7z=-28

We move all terms to the left:

7-7z-(-28)=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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