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