4z+9=z-21

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



4z+9=z-21

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+30=0

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

3z=-30

z=-30/3

z=-10

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