s+3s-s=18

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Solution for s+3s-s=18 equation: 



s+3s-s=18

We move all terms to the left:

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

We add all the numbers together, and all the variables

3s-18=0

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

3s=18

s=18/3

s=6

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