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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
106/25 = 12/x // - 12/x
106/25-(12/x) = 0
106/25-12*x^-1 = 0
-12*x^-1 = -106/25 // : -12
x^-1 = 53/150
-1 < 0
1/(x^1) = 53/150 // * x^1
1 = 53/150*x^1 // : 53/150
150/53 = x^1
x = 150/53
x = 150/53
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