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D( x )
2-(5*x) = 0
3*x-2 = 0
2-(5*x) = 0
2-(5*x) = 0
2-5*x = 0
2-5*x = 0 // - 2
-5*x = -2 // : -5
x = -2/(-5)
x = 2/5
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x in (-oo:2/5) U (2/5:2/3) U (2/3:+oo)
4/(3*x-2) = 7/(2-(5*x)) // - 7/(2-(5*x))
4/(3*x-2)-(7/(2-(5*x))) = 0
4/(3*x-2)-7*(2-5*x)^-1 = 0
4/(3*x-2)-7/(2-5*x) = 0
(4*(2-5*x))/((3*x-2)*(2-5*x))+(-7*(3*x-2))/((3*x-2)*(2-5*x)) = 0
4*(2-5*x)-7*(3*x-2) = 0
22-41*x = 0
(22-41*x)/((3*x-2)*(2-5*x)) = 0
(22-41*x)/((3*x-2)*(2-5*x)) = 0 // * (3*x-2)*(2-5*x)
22-41*x = 0
22-41*x = 0 // - 22
-41*x = -22 // : -41
x = -22/(-41)
x = 22/41
x = 22/41
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