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D( x )
8*x-24 = 0
4*x-12 = 0
7*x+8 = 0
8*x-24 = 0
8*x-24 = 0
8*x-24 = 0 // + 24
8*x = 24 // : 8
x = 24/8
x = 3
4*x-12 = 0
4*x-12 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
7*x+8 = 0
7*x+8 = 0
7*x+8 = 0 // - 8
7*x = -8 // : 7
x = -8/7
x in (-oo:-8/7) U (-8/7:3) U (3:+oo)
(((35*x^40)/(8*x-24))/(7*x+8))/(4*x-12) = 0
(35*x^40)/((8*x-24)*(7*x+8)*(4*x-12)) = 0
35*x^40 = 0 // : 35
x^40 = 0
x = 0
x = 0
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