10=9-z

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Solution for 10=9-z equation: 



10=9-z

We move all terms to the left:

10-(9-z)=0

We add all the numbers together, and all the variables

-(-1z+9)+10=0

We get rid of parentheses

1z-9+10=0

We add all the numbers together, and all the variables

z+1=0

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

z=-1

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