9=7z-13z=21

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Solution for 9=7z-13z=21 equation: 



9=7z-13z=21

We move all terms to the left:

9-(7z-13z)=0

We add all the numbers together, and all the variables

-(-6z)+9=0

We get rid of parentheses

6z+9=0

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

6z=-9

z=-9/6

z=-1+1/2

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