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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12.5/x = 229.6/156.9 // - 229.6/156.9
12.5/x-(229.6/156.9) = 0
12.5/x-1.46335245 = 0
12.5*x^-1 = 1.46335245 // : 12.5
x^-1 = 0.1170682
-1 < 0
1/(x^1) = 0.1170682 // * x^1
1 = 0.1170682*x^1 // : 0.1170682
8.54202935 = x^1
x = 8.54202935
x = 8.54202935
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