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D( x )
9*x = 0
6*x-5 = 0
9*x = 0
9*x = 0
9*x = 0 // : 9
x = 0
6*x-5 = 0
6*x-5 = 0
6*x-5 = 0 // + 5
6*x = 5 // : 6
x = 5/6
x in (-oo:0) U (0:5/6) U (5/6:+oo)
7/(6*x-5) = 2/(9*x) // - 2/(9*x)
7/(6*x-5)-(2/(9*x)) = 0
7/(6*x-5)+(-2/9)*x^-1 = 0
7/(6*x-5)-2/(9*x) = 0
(7*9*x)/(9*x*(6*x-5))+(-2*(6*x-5))/(9*x*(6*x-5)) = 0
7*9*x-2*(6*x-5) = 0
51*x+10 = 0
(51*x+10)/(9*x*(6*x-5)) = 0
(51*x+10)/(9*x*(6*x-5)) = 0 // * 9*x*(6*x-5)
51*x+10 = 0
51*x+10 = 0 // - 10
51*x = -10 // : 51
x = -10/51
x = -10/51
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