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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x-((3*x)/x) = -6 // + 6
5*x-((3*x)/x)+6 = 0
5*x-3+6 = 0
5*x+3 = 0 // - 3
5*x = -3 // : 5
x = -3/5
x = -3/5
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