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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+(2*x)/x-4+3 = 3*x+18/(x^2) // - 3*x+18/(x^2)
5/x-(3*x)-(18/(x^2))+(2*x)/x-4+3 = 0
5/x-3*x-18*x^-2+(2*x)/x-4+3 = 0
5*x^-1-3*x^1-18*x^-2+1*x^0 = 0
(1*x^2-3*x^3+5*x^1-18*x^0)/(x^2) = 0 // * x^4
x^2*(1*x^2-3*x^3+5*x^1-18*x^0) = 0
x^2
x^2-3*x^3+5*x-18 = 0
{ 1, -1, 2, -2, 3, -3, 6, -6, 9, -9, 18, -18 }
1
x = 1
x^2-3*x^3+5*x-18 = -15
1
-1
x = -1
x^2-3*x^3+5*x-18 = -19
-1
2
x = 2
x^2-3*x^3+5*x-18 = -28
2
-2
x = -2
x^2-3*x^3+5*x-18 = 0
-2
x+2
7*x-3*x^2-9
x^2-3*x^3+5*x-18
x+2
3*x^3+6*x^2
7*x^2+5*x-18
-7*x^2-14*x
-9*x-18
9*x+18
0
7*x-3*x^2-9 = 0
DELTA = 7^2-(-9*(-3)*4)
DELTA = -59
DELTA < 0
x in { -2}
x = -2
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