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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.075-((x+4)/x) = 0
(-1*(x+4))/x+2.075 = 0
(-1*(x+4))/x+(2.075*x)/x = 0
2.075*x-1*(x+4) = 0
1.075*x-4 = 0
(1.075*x-4)/x = 0
(1.075*x-4)/x = 0 // * x
1.075*x-4 = 0
1.075*x-4 = 0 // + 4
1.075*x = 4 // : 1.075
x = 4/1.075
x = 3.72093023
x = 3.72093023
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