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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1 = 12*x-(5*x)+12/x-(30/x) // - 12*x-(5*x)+12/x-(30/x)
5*x-(12*x)-(12/x)+30/x+1 = 0
5*x-12*x-12*x^-1+30/x+1 = 0
18*x^-1-7*x^1+1*x^0 = 0
(1*x^1-7*x^2+18*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^1-7*x^2+18*x^0) = 0
x^1
x-7*x^2+18 = 0
x-7*x^2+18 = 0
DELTA = 1^2-(-7*4*18)
DELTA = 505
DELTA > 0
x = (505^(1/2)-1)/(-7*2) or x = (-505^(1/2)-1)/(-7*2)
x = (505^(1/2)-1)/(-14) or x = (505^(1/2)+1)/14
x in { (505^(1/2)-1)/(-14), (505^(1/2)+1)/14}
x in { (505^(1/2)-1)/(-14), (505^(1/2)+1)/14 }
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