1s+2s+2s+20s=400

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Solution for 1s+2s+2s+20s=400 equation: 



1s+2s+2s+20s=400

We move all terms to the left:

1s+2s+2s+20s-(400)=0

We add all the numbers together, and all the variables

25s-400=0

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

25s=400

s=400/25

s=16

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