3(z+7)=z+7

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



3(z+7)=z+7

We move all terms to the left:

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

We multiply parentheses

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

We get rid of parentheses

3z-z-7+21=0

We add all the numbers together, and all the variables

2z+14=0

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

2z=-14

z=-14/2

z=-7

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