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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1800/x = 14 // - 14
1800/x-14 = 0
1800*x^-1 = 14 // : 1800
x^-1 = 7/900
-1 < 0
1/(x^1) = 7/900 // * x^1
1 = 7/900*x^1 // : 7/900
900/7 = x^1
x = 900/7
x = 900/7
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