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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
54/x = 50/100 // - 50/100
54/x-(50/100) = 0
54/x-1/2 = 0
54*x^-1 = 1/2 // : 54
x^-1 = 1/108
-1 < 0
1/(x^1) = 1/108 // * x^1
1 = 1/108*x^1 // : 1/108
108 = x^1
x = 108
x = 108
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