15-20s=-9-18s

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Solution for 15-20s=-9-18s equation: 



15-20s=-9-18s

We move all terms to the left:

15-20s-(-9-18s)=0

We add all the numbers together, and all the variables

-20s-(-18s-9)+15=0

We get rid of parentheses

-20s+18s+9+15=0

We add all the numbers together, and all the variables

-2s+24=0

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

-2s=-24

s=-24/-2

s=+12

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