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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
75/1.5 = 35/x // - 35/x
75/1.5-(35/x) = 0
75/1.5-35*x^-1 = 0
-35*x^-1 = -50 // : -35
x^-1 = 10/7
-1 < 0
1/(x^1) = 10/7 // * x^1
1 = 10/7*x^1 // : 10/7
7/10 = x^1
x = 7/10
x = 7/10
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