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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)
(30*x^3+4^2-150)/(3*x-5) = 0
(30*x^3-134)/(3*x-5) = 0
30*x^3 = 134 // : 30
x^3 = 67/15
x^3 = 67/15 // ^ 1/3
x = (67/15)^(1/3)
x = (67/15)^(1/3)
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