2/1s=4s-21

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Solution for 2/1s=4s-21 equation: 


s in (-oo:+oo)

(2/1)*s = 4*s-21 // - 4*s-21

(2/1)*s-(4*s)+21 = 0

2*s-4*s+21 = 0

21-2*s = 0 // - 21

-2*s = -21 // : -2

s = -21/(-2)

s = 21/2

s = 21/2

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