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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
54/x = 7 // - 7
54/x-7 = 0
54*x^-1 = 7 // : 54
x^-1 = 7/54
-1 < 0
1/(x^1) = 7/54 // * x^1
1 = 7/54*x^1 // : 7/54
54/7 = x^1
x = 54/7
x = 54/7
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