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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
m/x-3 = 2+5 // - 2+5
m/x-5-3-2 = 0
m*x^-1 = 10 // : m
x^-1 = 10/m
-1 < 0
1/(x^1) = 10/m // * x^1
1 = (10/m)*x^1 // : 10/m
1/(10/m) = x^1
x = 1/(10/m)
x = 1/(10/m)
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