11=z-9

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Solution for 11=z-9 equation: 



11=z-9

We move all terms to the left:

11-(z-9)=0

We get rid of parentheses

-z+9+11=0

We add all the numbers together, and all the variables

-1z+20=0

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

-z=-20

z=-20/-1

z=+20

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