9=z-12;z=20

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Solution for 9=z-12;z=20 equation: 



9=z-12z=20

We move all terms to the left:

9-(z-12z)=0

We add all the numbers together, and all the variables

-(-11z)+9=0

We get rid of parentheses

11z+9=0

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

11z=-9

z=-9/11

z=-9/11

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