-3s+-7s+20s-4s=-12

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Solution for -3s+-7s+20s-4s=-12 equation: 



-3s+-7s+20s-4s=-12

We move all terms to the left:

-3s+-7s+20s-4s-(-12)=0

We add all the numbers together, and all the variables

6s+12=0

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

6s=-12

s=-12/6

s=-2

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