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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 7.89 // - 7.89
5/x-7.89 = 0
5*x^-1 = 7.89 // : 5
x^-1 = 1.578
-1 < 0
1/(x^1) = 1.578 // * x^1
1 = 1.578*x^1 // : 1.578
0.63371356 = x^1
x = 0.63371356
x = 0.63371356
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