(1/2)s=4s-21

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


s in (-oo:+oo)

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

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

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

21-7/2*s = 0 // - 21

-7/2*s = -21 // : -7/2

s = -21/(-7/2)

s = 6

s = 6

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