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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)
3/(x^2)-(7/x)+2 = 0
3/(x^2)-7*x^-1+2 = 0
3*x^-2-7*x^-1+2 = 0
t_1 = x^-1
3*t_1^2-7*t_1^1+2 = 0
3*t_1^2-7*t_1+2 = 0
DELTA = (-7)^2-(2*3*4)
DELTA = 25
DELTA > 0
t_1 = (25^(1/2)+7)/(2*3) or t_1 = (7-25^(1/2))/(2*3)
t_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 = 2
x^-1-2 = 0
1*x^-1 = 2 // : 1
x^-1 = 2
-1 < 0
1/(x^1) = 2 // * x^1
1 = 2*x^1 // : 2
1/2 = x^1
x = 1/2
x in { 3, 1/2 }
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