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D( x )
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x in (-oo:2) U (2:+oo)
1/(2*x-4) = 31/24 // - 31/24
1/(2*x-4)-(31/24) = 0
1/(2*x-4)-31/24 = 0
(1*24)/(24*(2*x-4))+(-31*(2*x-4))/(24*(2*x-4)) = 0
1*24-31*(2*x-4) = 0
148-62*x = 0
(148-62*x)/(24*(2*x-4)) = 0
(148-62*x)/(24*(2*x-4)) = 0 // * 24*(2*x-4)
148-62*x = 0
148-62*x = 0 // - 148
-62*x = -148 // : -62
x = -148/(-62)
x = 74/31
x = 74/31
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