4z-9=7z-21

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Solution for 4z-9=7z-21 equation: 



4z-9=7z-21

We move all terms to the left:

4z-9-(7z-21)=0

We get rid of parentheses

4z-7z+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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