4z+9=z+21=z=

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Solution for 4z+9=z+21=z= equation: 



4z+9=z+21=z=

We move all terms to the left:

4z+9-(z+21)=0

We get rid of parentheses

4z-z-21+9=0

We add all the numbers together, and all the variables

3z-12=0

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

3z=12

z=12/3

z=4

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