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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.03 = (5-x)/x // - (5-x)/x
0.03-((5-x)/x) = 0
(-1*(5-x))/x+0.03 = 0
(-1*(5-x))/x+(0.03*x)/x = 0
0.03*x-1*(5-x) = 0
1.03*x-5 = 0
(1.03*x-5)/x = 0
(1.03*x-5)/x = 0 // * x
1.03*x-5 = 0
1.03*x-5 = 0 // + 5
1.03*x = 5 // : 1.03
x = 5/1.03
x = 4.85436893
x = 4.85436893
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