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D( x )
3*x = 0
2*x-3 = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
x in (-oo:0) U (0:3/2) U (3/2:+oo)
5/(2*x-3) = 7/(3*x) // - 7/(3*x)
5/(2*x-3)-(7/(3*x)) = 0
5/(2*x-3)+(-7/3)*x^-1 = 0
5/(2*x-3)-7/(3*x) = 0
(3*5*x)/(3*x*(2*x-3))+(-7*(2*x-3))/(3*x*(2*x-3)) = 0
3*5*x-7*(2*x-3) = 0
x+21 = 0
(x+21)/(3*x*(2*x-3)) = 0
(x+21)/(3*x*(2*x-3)) = 0 // * 3*x*(2*x-3)
x+21 = 0
x+21 = 0 // - 21
x = -21
x = -21
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