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D( x )
x < 0
x < 0
x in <0:+oo)
22/3+22.5 = (4/5)*x^7.5+18 // - (4/5)*x^7.5+18
22/3-((4/5)*x^7.5)-18+22.5 = 0
(-4/5)*x^7.5+22/3-18+22.5 = 0
-4/5*x^7.5 = -11.83333333 // : -4/5
x^7.5 = 14.79166666
x^7 = 14.79166666^(1/0.5) // ^ 1/7
x = 14.79166666^(2/7)
x = 14.79166666^(2/7)
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