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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x-(2/5) = 1 // - 1
14/x-(2/5)-1 = 0
14/x-2/5-1 = 0
14*x^-1 = 7/5 // : 14
x^-1 = 1/10
-1 < 0
1/(x^1) = 1/10 // * x^1
1 = 1/10*x^1 // : 1/10
10 = x^1
x = 10
x = 10
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