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D( x )
x = 0
59*x+36 = 0
x = 0
x = 0
59*x+36 = 0
59*x+36 = 0
59*x+36 = 0 // - 36
59*x = -36 // : 59
x = -36/59
x in (-oo:-36/59) U (-36/59:0) U (0:+oo)
(7*x)/(59*x+36) = 1/x // - 1/x
(7*x)/(59*x+36)-(1/x) = 0
(7*x)/(59*x+36)-x^-1 = 0
(7*x)/(59*x+36)-1/x = 0
(7*x*x)/(x*(59*x+36))+(-1*(59*x+36))/(x*(59*x+36)) = 0
7*x*x-1*(59*x+36) = 0
7*x^2-59*x-36 = 0
7*x^2-59*x-36 = 0
7*x^2-59*x-36 = 0
DELTA = (-59)^2-(-36*4*7)
DELTA = 4489
DELTA > 0
x = (4489^(1/2)+59)/(2*7) or x = (59-4489^(1/2))/(2*7)
x = 9 or x = -4/7
(x+4/7)*(x-9) = 0
((x+4/7)*(x-9))/(x*(59*x+36)) = 0
((x+4/7)*(x-9))/(x*(59*x+36)) = 0 // * x*(59*x+36)
(x+4/7)*(x-9) = 0
( x+4/7 )
x+4/7 = 0 // - 4/7
x = -4/7
( x-9 )
x-9 = 0 // + 9
x = 9
x in { -4/7, 9 }
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