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D( x )
3*x-((3/5)*x^2) = 0
3*x-((3/5)*x^2) = 0
3*x-((3/5)*x^2) = 0
(-3/5)*x^2+3*x = 0
3*x-3/5*x^2 = 0
DELTA = 3^2-(-3/5*0*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)-3)/(-3/5*2) or x = (-9^(1/2)-3)/(-3/5*2)
x = 0 or x = 5
x in (-oo:0) U (0:5) U (5:+oo)
(x+(3/5)*x)/(3*x-((3/5)*x^2)) = 0
(x+(3/5)*x)/((-3/5)*x^2+3*x) = 0
(8/5*x)/(3*x-3/5*x^2) = 0
3*x-3/5*x^2 = 0
3*x*(1-1/5*x) = 0
1-1/5*x = 0 // - 1
-1/5*x = -1 // : -1/5
x = -1/(-1/5)
x = 5
3*x*(x-5) = 0
(8/5*x)/(3*x*(x-5)) = 0
8/5*x = 0 // : 8/5
x = 0
x in { 0}
x belongs to the empty set
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