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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
2/(3*x)-(5*6*x) = 4 // - 4
2/(3*x)-(5*6*x)-4 = 0
2/(3*x)-30*x-4 = 0
2/3*x^-1-30*x^1-4*x^0 = 0
(2/3*x^0-30*x^2-4*x^1)/(x^1) = 0 // * x^2
x^1*(2/3*x^0-30*x^2-4*x^1) = 0
x^1
2/3-30*x^2-4*x = 0
2/3-30*x^2-4*x = 0
DELTA = (-4)^2-(-30*4*(2/3))
DELTA = 96
DELTA > 0
x = (96^(1/2)+4)/(-30*2) or x = (4-96^(1/2))/(-30*2)
x = (4*6^(1/2)+4)/(-60) or x = (4-4*6^(1/2))/(-60)
x in { (4*6^(1/2)+4)/(-60), (4-4*6^(1/2))/(-60)}
x in { (4*6^(1/2)+4)/(-60), (4-4*6^(1/2))/(-60) }
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