-7s-4s-2s+-7s=-20

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Solution for -7s-4s-2s+-7s=-20 equation: 



-7s-4s-2s+-7s=-20

We move all terms to the left:

-7s-4s-2s+-7s-(-20)=0

We add all the numbers together, and all the variables

-20s+20=0

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

-20s=-20

s=-20/-20

s=1

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