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