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D( x )
x/5 = 0
x/5 = 0
x/5 = 0
1/5*x = 0 // : 1/5
x = 0
x in (-oo:0) U (0:+oo)
(10-6)/(x/5) = -4 // + 4
(10-6)/(x/5)+4 = 0
20*x^-1 = -4 // : 20
x^-1 = -1/5
-1 < 0
1/(x^1) = -1/5 // * x^1
1 = -1/5*x^1 // : -1/5
-5 = x^1
x = -5
x = -5
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