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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.32/0.56 = 8/x // - 8/x
0.32/0.56-(8/x) = 0
0.32/0.56-8*x^-1 = 0
-8*x^-1 = -0.57142857 // : -8
x^-1 = 0.07142857
-1 < 0
1/(x^1) = 0.07142857 // * x^1
1 = 0.07142857*x^1 // : 0.07142857
14.00000028 = x^1
x = 14.00000028
x = 14.00000028
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