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s in (-oo:+oo)
6 = 8*((s^3)/4)-20 // - 8*((s^3)/4)-20
6-(8*((s^3)/4))+20 = 0
6-2*s^3+20 = 0
-2*s^3 = -26 // : -2
s^3 = 13
s^3 = 13 // ^ 1/3
s = 13^(1/3)
s = 13^(1/3)
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