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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.7/x = 9.14 // - 9.14
2.7/x-9.14 = 0
2.7*x^-1 = 9.14 // : 2.7
x^-1 = 3.38518519
-1 < 0
1/(x^1) = 3.38518519 // * x^1
1 = 3.38518519*x^1 // : 3.38518519
0.29540481 = x^1
x = 0.29540481
x = 0.29540481
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