1s+2s-3s+2s+1s=18

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Solution for 1s+2s-3s+2s+1s=18 equation: 



1s+2s-3s+2s+1s=18

We move all terms to the left:

1s+2s-3s+2s+1s-(18)=0

We add all the numbers together, and all the variables

3s-18=0

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

3s=18

s=18/3

s=6

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