3=18-s

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Solution for 3=18-s equation: 



3=18-s

We move all terms to the left:

3-(18-s)=0

We add all the numbers together, and all the variables

-(-1s+18)+3=0

We get rid of parentheses

1s-18+3=0

We add all the numbers together, and all the variables

s-15=0

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

s=15

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