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D( x )
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0 // + 5
3*x = 5 // : 3
x = 5/3
x in (-oo:5/3) U (5/3:+oo)
(-6*x^2-(10*x))/(3*x-5) = 0
(-6*x^2-10*x)/(3*x-5) = 0
-6*x^2-10*x = 0
-2*x*(3*x+5) = 0
3*x+5 = 0 // - 5
3*x = -5 // : 3
x = -5/3
-2*x*(x+5/3) = 0
(-2*x*(x+5/3))/(3*x-5) = 0
( -2*x )
-2*x = 0 // : -2
x = 0
( x+5/3 )
x+5/3 = 0 // - 5/3
x = -5/3
x in { 0, -5/3 }
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