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D( x )
(-177/36)*x^3 = 0
(-177/36)*x^3 = 0
(-177/36)*x^3 = 0
-59/12*x^3 = 0 // : -59/12
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
((13*x^5)/18)/((-177/36)*x^3) = 0
-26/177*x^2 = 0 // : -26/177
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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