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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x+1 = (5*x)/4 // - (5*x)/4
x/x-((5*x)/4)+1 = 0
(-5/4)*x+x/x+1 = 0
2-5/4*x = 0 // - 2
-5/4*x = -2 // : -5/4
x = -2/(-5/4)
x = 8/5
x = 8/5
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