7s-9s-(-20s)=-18

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Solution for 7s-9s-(-20s)=-18 equation: 



7s-9s-(-20s)=-18

We move all terms to the left:

7s-9s-(-20s)-(-18)=0

We add all the numbers together, and all the variables

-2s-(-20s)+18=0

We get rid of parentheses

-2s+20s+18=0

We add all the numbers together, and all the variables

18s+18=0

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

18s=-18

s=-18/18

s=-1

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