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D( x )
3*x+10 = 0
9*x-1 = 0
3*x+10 = 0
3*x+10 = 0
3*x+10 = 0 // - 10
3*x = -10 // : 3
x = -10/3
9*x-1 = 0
9*x-1 = 0
9*x-1 = 0 // + 1
9*x = 1 // : 9
x = 1/9
x in (-oo:-10/3) U (-10/3:1/9) U (1/9:+oo)
(6*x-4)/(9*x-1) = (2*x+5)/(3*x+10) // - (2*x+5)/(3*x+10)
(6*x-4)/(9*x-1)-((2*x+5)/(3*x+10)) = 0
(6*x-4)/(9*x-1)+(-1*(2*x+5))/(3*x+10) = 0
((6*x-4)*(3*x+10))/((9*x-1)*(3*x+10))+(-1*(2*x+5)*(9*x-1))/((9*x-1)*(3*x+10)) = 0
(6*x-4)*(3*x+10)-1*(2*x+5)*(9*x-1) = 0
5*x-35 = 0
(5*x-35)/((9*x-1)*(3*x+10)) = 0
(5*x-35)/((9*x-1)*(3*x+10)) = 0 // * (9*x-1)*(3*x+10)
5*x-35 = 0
5*x-35 = 0 // + 35
5*x = 35 // : 5
x = 35/5
x = 7
x = 7
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