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D( y )
3*y = 0
4*y^2 = 0
3*y = 0
3*y = 0
3*y = 0 // : 3
y = 0
4*y^2 = 0
4*y^2 = 0
4*y^2 = 0 // : 4
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
7/(4*y^2)-(7/(3*y)) = 0
(-7/3)*y^-1+7/(4*y^2) = 0
7/4*y^-2-7/3*y^-1 = 0
t_1 = y^-1
7/4*t_1^2-7/3*t_1^1 = 0
7/4*t_1^2-7/3*t_1 = 0
DELTA = (-7/3)^2-(0*7/4*4)
DELTA = 49/9
DELTA > 0
t_1 = ((49/9)^(1/2)+7/3)/(7/4*2) or t_1 = (7/3-(49/9)^(1/2))/(7/4*2)
t_1 = 4/3 or t_1 = 0
t_1 = 0
y^-1+0 = 0
y^-1 = 0
1*y^-1 = 0 // : 1
y^-1 = 0
y należy do O
t_1 = 4/3
y^-1-4/3 = 0
1*y^-1 = 4/3 // : 1
y^-1 = 4/3
-1 < 0
1/(y^1) = 4/3 // * y^1
1 = 4/3*y^1 // : 4/3
3/4 = y^1
y = 3/4
y = 3/4
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