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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50/45 = 1400/x // - 1400/x
50/45-(1400/x) = 0
50/45-1400*x^-1 = 0
-1400*x^-1 = -10/9 // : -1400
x^-1 = 1/1260
-1 < 0
1/(x^1) = 1/1260 // * x^1
1 = 1/1260*x^1 // : 1/1260
1260 = x^1
x = 1260
x = 1260
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