18s+s-7s-7s=20

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Solution for 18s+s-7s-7s=20 equation: 



18s+s-7s-7s=20

We move all terms to the left:

18s+s-7s-7s-(20)=0

We add all the numbers together, and all the variables

5s-20=0

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

5s=20

s=20/5

s=4

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