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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4 = 36/x-10 // - 36/x-10
4-(36/x)+10 = 0
4-36*x^-1+10 = 0
-36*x^-1 = -14 // : -36
x^-1 = 7/18
-1 < 0
1/(x^1) = 7/18 // * x^1
1 = 7/18*x^1 // : 7/18
18/7 = x^1
x = 18/7
x = 18/7
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