2z=5z-21

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Solution for 2z=5z-21 equation: 



2z=5z-21

We move all terms to the left:

2z-(5z-21)=0

We get rid of parentheses

2z-5z+21=0

We add all the numbers together, and all the variables

-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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