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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.6/12.7 = 4.9/x // - 4.9/x
5.6/12.7-(4.9/x) = 0
5.6/12.7-4.9*x^-1 = 0
-4.9*x^-1 = -0.44094488 // : -4.9
x^-1 = 0.08998875
-1 < 0
1/(x^1) = 0.08998875 // * x^1
1 = 0.08998875*x^1 // : 0.08998875
11.11250017 = x^1
x = 11.11250017
x = 11.11250017
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