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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 135/8 // - 135/8
7/x-(135/8) = 0
7/x-135/8 = 0
7*x^-1 = 135/8 // : 7
x^-1 = 135/56
-1 < 0
1/(x^1) = 135/56 // * x^1
1 = 135/56*x^1 // : 135/56
56/135 = x^1
x = 56/135
x = 56/135
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