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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-2.75/x = 5/6 // - 5/6
-2.75/x-(5/6) = 0
-2.75/x-5/6 = 0
-2.75*x^-1 = 5/6 // : -2.75
x^-1 = -0.3030303
-1 < 0
1/(x^1) = -0.3030303 // * x^1
1 = -0.3030303*x^1 // : -0.3030303
-3.30000003 = x^1
x = -3.30000003
x = -3.30000003
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