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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 41/100 // - 41/100
15/x-(41/100) = 0
15/x-41/100 = 0
15*x^-1 = 41/100 // : 15
x^-1 = 41/1500
-1 < 0
1/(x^1) = 41/1500 // * x^1
1 = 41/1500*x^1 // : 41/1500
1500/41 = x^1
x = 1500/41
x = 1500/41
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