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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
66/x = 3/4 // - 3/4
66/x-(3/4) = 0
66/x-3/4 = 0
66*x^-1 = 3/4 // : 66
x^-1 = 1/88
-1 < 0
1/(x^1) = 1/88 // * x^1
1 = 1/88*x^1 // : 1/88
88 = x^1
x = 88
x = 88
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