13s+s-7s-4s=20

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Solution for 13s+s-7s-4s=20 equation: 



13s+s-7s-4s=20

We move all terms to the left:

13s+s-7s-4s-(20)=0

We add all the numbers together, and all the variables

3s-20=0

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

3s=20

s=20/3

s=6+2/3

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