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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)
18/(x^2)-(15/x)+3 = 0
18/(x^2)-15*x^-1+3 = 0
18*x^-2-15*x^-1+3 = 0
t_1 = x^-1
18*t_1^2-15*t_1^1+3 = 0
18*t_1^2-15*t_1+3 = 0
DELTA = (-15)^2-(3*4*18)
DELTA = 9
DELTA > 0
t_1 = (9^(1/2)+15)/(2*18) or t_1 = (15-9^(1/2))/(2*18)
t_1 = 1/2 or t_1 = 1/3
t_1 = 1/3
x^-1-1/3 = 0
1*x^-1 = 1/3 // : 1
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
t_1 = 1/2
x^-1-1/2 = 0
1*x^-1 = 1/2 // : 1
x^-1 = 1/2
-1 < 0
1/(x^1) = 1/2 // * x^1
1 = 1/2*x^1 // : 1/2
2 = x^1
x = 2
x in { 3, 2 }
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