3(z-+7)=21

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Solution for 3(z-+7)=21 equation: 



3(z-+7)=21

We move all terms to the left:

3(z-+7)-(21)=0

We add all the numbers together, and all the variables

3(+z)-21=0

We multiply parentheses

3z-21=0

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

3z=21

z=21/3

z=7

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