20=z+11

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Solution for 20=z+11 equation: 



20=z+11

We move all terms to the left:

20-(z+11)=0

We get rid of parentheses

-z-11+20=0

We add all the numbers together, and all the variables

-1z+9=0

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

-z=-9

z=-9/-1

z=+9

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