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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1*7*x = (5/x)*x-4 // - (5/x)*x-4
1*7*x-((5/x)*x)+4 = 0
7*x-5+4 = 0
7*x-1 = 0 // + 1
7*x = 1 // : 7
x = 1/7
x = 1/7
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