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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
42.4 = 544/x // - 544/x
42.4-(544/x) = 0
42.4-544*x^-1 = 0
-544*x^-1 = -42.4 // : -544
x^-1 = 0.07794118
-1 < 0
1/(x^1) = 0.07794118 // * x^1
1 = 0.07794118*x^1 // : 0.07794118
12.8301881 = x^1
x = 12.8301881
x = 12.8301881
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