15s-13s=20

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Solution for 15s-13s=20 equation: 



15s-13s=20

We move all terms to the left:

15s-13s-(20)=0

We add all the numbers together, and all the variables

2s-20=0

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

2s=20

s=20/2

s=10

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