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s in (-oo:+oo)
(2/5)*s*(s+20) = 20 // - 20
(2/5)*s*(s+20)-20 = 0
2/5*s*(s+20)-20 = 0
2/5*s*(s+20)-20 = 0
2/5*s^2+8*s-20 = 0
2/5*s^2+8*s-20 = 0
2*(1/5*s^2+4*s-10) = 0
1/5*s^2+4*s-10 = 0
DELTA = 4^2-(-10*1/5*4)
DELTA = 24
DELTA > 0
s = (24^(1/2)-4)/(1/5*2) or s = (-24^(1/2)-4)/(1/5*2)
s = 5/2*(2*6^(1/2)-4) or s = 5/2*(-2*6^(1/2)-4)
2*(s-5/2*(-2*6^(1/2)-4))*(s-5/2*(2*6^(1/2)-4)) = 0
2*(s-5/2*(-2*6^(1/2)-4))*(s-5/2*(2*6^(1/2)-4)) = 0
( s-5/2*(-2*6^(1/2)-4) )
s-5/2*(-2*6^(1/2)-4) = 0 // + -5/2*(-2*6^(1/2)-4)
s = -(-5/2*(-2*6^(1/2)-4))
s = 5/2*(-2*6^(1/2)-4)
( s-5/2*(2*6^(1/2)-4) )
s-5/2*(2*6^(1/2)-4) = 0 // + -5/2*(2*6^(1/2)-4)
s = -(-5/2*(2*6^(1/2)-4))
s = 5/2*(2*6^(1/2)-4)
s in { 5/2*(-2*6^(1/2)-4), 5/2*(2*6^(1/2)-4) }
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