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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-261)/x = 0.07 // - 0.07
(x-261)/x-0.07 = 0
(x-261)/x+(-0.07*x)/x = 0
x-0.07*x-261 = 0
0.93*x-261 = 0
(0.93*x-261)/x = 0
(0.93*x-261)/x = 0 // * x
0.93*x-261 = 0
0.93*x-261 = 0 // + 261
0.93*x = 261 // : 0.93
x = 261/0.93
x = 280.64516129
x = 280.64516129
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