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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-325)/x = 0.12 // - 0.12
(x-325)/x-0.12 = 0
(x-325)/x+(-0.12*x)/x = 0
x-0.12*x-325 = 0
0.88*x-325 = 0
(0.88*x-325)/x = 0
(0.88*x-325)/x = 0 // * x
0.88*x-325 = 0
0.88*x-325 = 0 // + 325
0.88*x = 325 // : 0.88
x = 325/0.88
x = 369.31818182
x = 369.31818182
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