13s-3s=40

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Solution for 13s-3s=40 equation: 



13s-3s=40

We move all terms to the left:

13s-3s-(40)=0

We add all the numbers together, and all the variables

10s-40=0

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

10s=40

s=40/10

s=4

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