18=7-s

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Solution for 18=7-s equation: 



18=7-s

We move all terms to the left:

18-(7-s)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1s-7+18=0

We add all the numbers together, and all the variables

s+11=0

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

s=-11

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