2z+21=9z

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Solution for 2z+21=9z equation: 



2z+21=9z

We move all terms to the left:

2z+21-(9z)=0

We add all the numbers together, and all the variables

-7z+21=0

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

-7z=-21

z=-21/-7

z=+3

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