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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((30*x)/(x^2)-64)*(3*x-((24/10)*x^2)) = 0
((30*x)/(x^2)-64)*((-12/5)*x^2+3*x) = 0
(30*x^-1-64)*(3*x-12/5*x^2) = 0
3*x-12/5*x^2 = 0
3*x*(1-4/5*x) = 0
1-4/5*x = 0 // - 1
-4/5*x = -1 // : -4/5
x = -1/(-4/5)
x = 5/4
3*x*(x-5/4) = 0
3*x*(30*x^-1-64)*(x-5/4) = 0
( 3*x )
3*x = 0 // : 3
x = 0
( 30*x^-1-64 )
30*x^-1 = 64 // : 30
x^-1 = 32/15
-1 < 0
1/(x^1) = 32/15 // * x^1
1 = 32/15*x^1 // : 32/15
15/32 = x^1
x = 15/32
( x-5/4 )
x-5/4 = 0 // + 5/4
x = 5/4
x in { 0}
x in { 15/32, 5/4 }
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