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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.7/x = 3/4 // - 3/4
2.7/x-(3/4) = 0
2.7/x-3/4 = 0
2.7*x^-1 = 3/4 // : 2.7
x^-1 = 0.27777778
-1 < 0
1/(x^1) = 0.27777778 // * x^1
1 = 0.27777778*x^1 // : 0.27777778
3.59999997 = x^1
x = 3.59999997
x = 3.59999997
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