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D( x )
10*x = 0
14*x^2 = 0
10*x = 0
10*x = 0
10*x = 0 // : 10
x = 0
14*x^2 = 0
14*x^2 = 0
14*x^2 = 0 // : 14
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
3/(10*x)-(9/(14*x^2)) = 0
3/(10*x)+(-9/14)*x^-2 = 0
3/10*x^-1-9/14*x^-2 = 0
t_1 = x^-1
3/10*t_1^1-9/14*t_1^2 = 0
3/10*t_1-9/14*t_1^2 = 0
DELTA = (3/10)^2-(-9/14*0*4)
DELTA = 9/100
DELTA > 0
t_1 = ((9/100)^(1/2)-3/10)/(-9/14*2) or t_1 = (-(9/100)^(1/2)-3/10)/(-9/14*2)
t_1 = 0 or t_1 = 7/15
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
t_1 = 7/15
x^-1-7/15 = 0
1*x^-1 = 7/15 // : 1
x^-1 = 7/15
-1 < 0
1/(x^1) = 7/15 // * x^1
1 = 7/15*x^1 // : 7/15
15/7 = x^1
x = 15/7
x = 15/7
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