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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/8 = 12/x // - 12/x
2/8-(12/x) = 0
2/8-12*x^-1 = 0
-12*x^-1 = -1/4 // : -12
x^-1 = 1/48
-1 < 0
1/(x^1) = 1/48 // * x^1
1 = 1/48*x^1 // : 1/48
48 = x^1
x = 48
x = 48
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