S3/4=-20

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Solution for S3/4=-20 equation: 


S in (-oo:+oo)

(S^3)/4 = -20 // + 20

(S^3)/4+20 = 0

1/4*S^3 = -20 // : 1/4

S^3 = -80

S^3 = -80 // ^ 1/3

S = -2*10^(1/3)

S = -2*10^(1/3)

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