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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
55/4 = 38/x // - 38/x
55/4-(38/x) = 0
55/4-38*x^-1 = 0
-38*x^-1 = -55/4 // : -38
x^-1 = 55/152
-1 < 0
1/(x^1) = 55/152 // * x^1
1 = 55/152*x^1 // : 55/152
152/55 = x^1
x = 152/55
x = 152/55
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