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3*x^(13/5)-(20*x^(8/5))+25*x^(3/5) = 0
3*x^(13/5)-20*x^(8/5)+25*x^(3/5) = 0
3*x^(13/5)-20*x^(8/5)+25*x^(3/5) = 0
x^(3/5)*(3*x^2-20*x+25) = 0
3*x^2-20*x+25 = 0
DELTA = (-20)^2-(3*4*25)
DELTA = 100
DELTA > 0
x = (100^(1/2)+20)/(2*3) or x = (20-100^(1/2))/(2*3)
x = 5 or x = 5/3
x^(3/5) = 0
1*x^(3/5) = 0 // : 1
x^(3/5) = 0
x = 0
x in { 5/3, 5, 0 }
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