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D( x )
2*x+1 = 0
2*x-1 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:-1/2) U (-1/2:1/2) U (1/2:+oo)
24/(2*x-1) = 72/(2*x+1) // - 72/(2*x+1)
24/(2*x-1)-(72/(2*x+1)) = 0
24/(2*x-1)-72*(2*x+1)^-1 = 0
24/(2*x-1)-72/(2*x+1) = 0
(24*(2*x+1))/((2*x-1)*(2*x+1))+(-72*(2*x-1))/((2*x-1)*(2*x+1)) = 0
24*(2*x+1)-72*(2*x-1) = 0
96-96*x = 0
(96-96*x)/((2*x-1)*(2*x+1)) = 0
(96-96*x)/((2*x-1)*(2*x+1)) = 0 // * (2*x-1)*(2*x+1)
96-96*x = 0
96-96*x = 0 // - 96
-96*x = -96 // : -96
x = -96/(-96)
x = 1
x = 1
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