11=9+z

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Solution for 11=9+z equation: 



11=9+z

We move all terms to the left:

11-(9+z)=0

We add all the numbers together, and all the variables

-(z+9)+11=0

We get rid of parentheses

-z-9+11=0

We add all the numbers together, and all the variables

-1z+2=0

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

-z=-2

z=-2/-1

z=+2

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