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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(47000-x)/x = 9.8 // - 9.8
(47000-x)/x-9.8 = 0
(47000-x)/x+(-9.8*x)/x = 0
47000-x-9.8*x = 0
47000-10.8*x = 0
(47000-10.8*x)/x = 0
(47000-10.8*x)/x = 0 // * x
47000-10.8*x = 0
47000-10.8*x = 0 // - 47000
-10.8*x = -47000 // : -10.8
x = -47000/(-10.8)
x = 4351.85185185
x = 4351.85185185
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