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D( x )
5*x+3 = 0
5*x+3 = 0
5*x+3 = 0
5*x+3 = 0 // - 3
5*x = -3 // : 5
x = -3/5
x in (-oo:-3/5) U (-3/5:+oo)
(5*x-9)/(5*x+3) = 5/6 // - 5/6
(5*x-9)/(5*x+3)-(5/6) = 0
(5*x-9)/(5*x+3)-5/6 = 0
(6*(5*x-9))/(6*(5*x+3))+(-5*(5*x+3))/(6*(5*x+3)) = 0
6*(5*x-9)-5*(5*x+3) = 0
5*x-69 = 0
(5*x-69)/(6*(5*x+3)) = 0
(5*x-69)/(6*(5*x+3)) = 0 // * 6*(5*x+3)
5*x-69 = 0
5*x-69 = 0 // + 69
5*x = 69 // : 5
x = 69/5
x = 69/5
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