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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
90/100 = 14.4/x // - 14.4/x
90/100-(14.4/x) = 0
90/100-14.4*x^-1 = 0
-14.4*x^-1 = -9/10 // : -14.4
x^-1 = 0.0625
-1 < 0
1/(x^1) = 0.0625 // * x^1
1 = 0.0625*x^1 // : 0.0625
16 = x^1
x = 16
x = 16
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