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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-2 = 70 // - 70
3/x-70-2 = 0
3*x^-1 = 72 // : 3
x^-1 = 24
-1 < 0
1/(x^1) = 24 // * x^1
1 = 24*x^1 // : 24
1/24 = x^1
x = 1/24
x = 1/24
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