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x in (-oo:+oo)
(13*x^4)/7-((2*x^5)/7) = 0
(-2/7)*x^5+(13*x^4)/7 = 0
13/7*x^4-2/7*x^5 = 0
1/7*x^4*(13-2*x) = 0
13-2*x = 0 // - 13
-2*x = -13 // : -2
x = -13/(-2)
x = 13/2
(x^4)/7 = 0
1/7*x^4 = 0 // : 1/7
x^4 = 0
x = 0
x in { 13/2, 0 }
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