15s-9s=18

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Solution for 15s-9s=18 equation: 



15s-9s=18

We move all terms to the left:

15s-9s-(18)=0

We add all the numbers together, and all the variables

6s-18=0

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

6s=18

s=18/6

s=3

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