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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
240*((2*480*x^2)/x) = 6*x-11 // - 6*x-11
240*((2*480*x^2)/x)-(6*x)+11 = 0
240*((2*480*x^2)/x)-6*x+11 = 0
230394*x+11 = 0 // - 11
230394*x = -11 // : 230394
x = -11/230394
x = -11/230394
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