2z+21=9z+7

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Solution for 2z+21=9z+7 equation: 



2z+21=9z+7

We move all terms to the left:

2z+21-(9z+7)=0

We get rid of parentheses

2z-9z-7+21=0

We add all the numbers together, and all the variables

-7z+14=0

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

-7z=-14

z=-14/-7

z=+2

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