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D( x )
x = 0
29*x+30 = 0
x = 0
x = 0
29*x+30 = 0
29*x+30 = 0
29*x+30 = 0 // - 30
29*x = -30 // : 29
x = -30/29
x in (-oo:-30/29) U (-30/29:0) U (0:+oo)
(7*x)/(29*x+30) = 1/x // - 1/x
(7*x)/(29*x+30)-(1/x) = 0
(7*x)/(29*x+30)-x^-1 = 0
(7*x)/(29*x+30)-1/x = 0
(7*x*x)/(x*(29*x+30))+(-1*(29*x+30))/(x*(29*x+30)) = 0
7*x*x-1*(29*x+30) = 0
7*x^2-29*x-30 = 0
7*x^2-29*x-30 = 0
7*x^2-29*x-30 = 0
DELTA = (-29)^2-(-30*4*7)
DELTA = 1681
DELTA > 0
x = (1681^(1/2)+29)/(2*7) or x = (29-1681^(1/2))/(2*7)
x = 5 or x = -6/7
(x+6/7)*(x-5) = 0
((x+6/7)*(x-5))/(x*(29*x+30)) = 0
((x+6/7)*(x-5))/(x*(29*x+30)) = 0 // * x*(29*x+30)
(x+6/7)*(x-5) = 0
( x+6/7 )
x+6/7 = 0 // - 6/7
x = -6/7
( x-5 )
x-5 = 0 // + 5
x = 5
x in { -6/7, 5 }
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