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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
48/x = 16/45 // - 16/45
48/x-(16/45) = 0
48/x-16/45 = 0
48*x^-1 = 16/45 // : 48
x^-1 = 1/135
-1 < 0
1/(x^1) = 1/135 // * x^1
1 = 1/135*x^1 // : 1/135
135 = x^1
x = 135
x = 135
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