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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x+5)/4-x-((5*x)/x)+3 = 0
(4*x+5)/4-x-5+3 = 0
(4*x+5)/4+(4*(-x))/4+(-5*4)/4+(3*4)/4 = 0
4*x+4*(-x)-5*4+3*4+5 = 0
5-20+12 = 0
12-15 = 0
-3 = 0
-3/4 = 0
-3/4 = 0 // * 4
-3 = 0
x belongs to the empty set
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