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D( x )
22.5*x < 0
22.5*x < 0
22.5*x < 0
22.5*x+0 < 0 // - 0
22.5*x < 0 // : 22.5
x < 0/22.5
x < 0
x in <0:+oo)
(1/2)*(22.5*x)^247.5 = 0
1/2*22.5^247.5*x^247.5 = 0 // : 1/2*22.5^247.5
x^247.5 = 0
x = 0
x = 0
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