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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-983)/x = 0.03 // - 0.03
(x-983)/x-0.03 = 0
(x-983)/x+(-0.03*x)/x = 0
x-0.03*x-983 = 0
0.97*x-983 = 0
(0.97*x-983)/x = 0
(0.97*x-983)/x = 0 // * x
0.97*x-983 = 0
0.97*x-983 = 0 // + 983
0.97*x = 983 // : 0.97
x = 983/0.97
x = 1013.40206186
x = 1013.40206186
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