18s+-12s-s=-20

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Solution for 18s+-12s-s=-20 equation: 



18s+-12s-s=-20

We move all terms to the left:

18s+-12s-s-(-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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