7z-21=56

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Solution for 7z-21=56 equation: 



7z-21=56

We move all terms to the left:

7z-21-(56)=0

We add all the numbers together, and all the variables

7z-77=0

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

7z=77

z=77/7

z=11

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