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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/88 = 21/x // - 21/x
6/88-(21/x) = 0
6/88-21*x^-1 = 0
-21*x^-1 = -3/44 // : -21
x^-1 = 1/308
-1 < 0
1/(x^1) = 1/308 // * x^1
1 = 1/308*x^1 // : 1/308
308 = x^1
x = 308
x = 308
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