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-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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