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D( x )
x = 0
7/9-((7/3)*x) = 0
x = 0
x = 0
7/9-((7/3)*x) = 0
7/9-((7/3)*x) = 0
(-7/3)*x+7/9 = 0
7/9-7/3*x = 0 // - 7/9
-7/3*x = -7/9 // : -7/3
x = -7/9/(-7/3)
x = 1/3
x in (-oo:0) U (0:1/3) U (1/3:+oo)
(x/9-(1/x))/(7/9-((7/3)*x)) = 0
(x/9-x^-1)/((-7/3)*x+7/9) = 0
(1/9*x-x^-1)/(7/9-7/3*x) = 0
1/9*x-x^-1 = 0
x^-1*(1/9*x^2-1) = 0
1/9*x^2 = 1 // : 1/9
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x^-1*(x-3)*(x+3) = 0
(x^-1*(x-3)*(x+3))/(7/9-7/3*x) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x-3 )
x-3 = 0 // + 3
x = 3
( x^-1 )
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x in { -3, 3 }
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