13s+4s-15s=18

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Solution for 13s+4s-15s=18 equation: 



13s+4s-15s=18

We move all terms to the left:

13s+4s-15s-(18)=0

We add all the numbers together, and all the variables

2s-18=0

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

2s=18

s=18/2

s=9

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