-15s+5s=20

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Solution for -15s+5s=20 equation: 



-15s+5s=20

We move all terms to the left:

-15s+5s-(20)=0

We add all the numbers together, and all the variables

-10s-20=0

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

-10s=20

s=20/-10

s=-2

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