3(z-1)=21

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Solution for 3(z-1)=21 equation: 



3(z-1)=21

We move all terms to the left:

3(z-1)-(21)=0

We multiply parentheses

3z-3-21=0

We add all the numbers together, and all the variables

3z-24=0

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

3z=24

z=24/3

z=8

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