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D( x )
7*x = 0
3*x^2 = 0
7*x = 0
7*x = 0
7*x = 0 // : 7
x = 0
3*x^2 = 0
3*x^2 = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
4/(3*x^2)-(2/(7*x)) = 0
(-2/7)*x^-1+4/(3*x^2) = 0
4/3*x^-2-2/7*x^-1 = 0
t_1 = x^-1
4/3*t_1^2-2/7*t_1^1 = 0
4/3*t_1^2-2/7*t_1 = 0
DELTA = (-2/7)^2-(0*4/3*4)
DELTA = 4/49
DELTA > 0
t_1 = ((4/49)^(1/2)+2/7)/(4/3*2) or t_1 = (2/7-(4/49)^(1/2))/(4/3*2)
t_1 = 3/14 or t_1 = 0
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
t_1 = 3/14
x^-1-3/14 = 0
1*x^-1 = 3/14 // : 1
x^-1 = 3/14
-1 < 0
1/(x^1) = 3/14 // * x^1
1 = 3/14*x^1 // : 3/14
14/3 = x^1
x = 14/3
x = 14/3
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