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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.75/x = 0.6 // - 0.6
0.75/x-0.6 = 0
0.75*x^-1 = 0.6 // : 0.75
x^-1 = 0.8
-1 < 0
1/(x^1) = 0.8 // * x^1
1 = 0.8*x^1 // : 0.8
1.25 = x^1
x = 1.25
x = 1.25
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