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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/10 = 0.5/x // - 0.5/x
7/10-(0.5/x) = 0
7/10-0.5*x^-1 = 0
-0.5*x^-1 = -7/10 // : -0.5
x^-1 = 1.4
-1 < 0
1/(x^1) = 1.4 // * x^1
1 = 1.4*x^1 // : 1.4
0.71428571 = x^1
x = 0.71428571
x = 0.71428571
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