7s+18s=100

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Solution for 7s+18s=100 equation: 



7s+18s=100

We move all terms to the left:

7s+18s-(100)=0

We add all the numbers together, and all the variables

25s-100=0

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

25s=100

s=100/25

s=4

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