18=7-z

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Solution for 18=7-z equation: 



18=7-z

We move all terms to the left:

18-(7-z)=0

We add all the numbers together, and all the variables

-(-1z+7)+18=0

We get rid of parentheses

1z-7+18=0

We add all the numbers together, and all the variables

z+11=0

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

z=-11

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