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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35-(5/20)-5 = 0.05-(0.2/x)-0.05 // - 0.05-(0.2/x)-0.05
0.2/x-(5/20)-5-0.05+0.05+35 = 0
0.2/x-1/4-5-0.05+0.05+35 = 0
0.2*x^-1 = -29.75 // : 0.2
x^-1 = -148.75
-1 < 0
1/(x^1) = -148.75 // * x^1
1 = -148.75*x^1 // : -148.75
-0.00672269 = x^1
x = -0.00672269
x = -0.00672269
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