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(4*x^5)/7-((5*x^2)/14) = 0
(4*x^5)/7+(-5/14)*x^2 = 0
4/7*x^5-5/14*x^2 = 0
1/7*x^2*(4*x^3-5/2) = 0
4*x^3 = 5/2 // : 4
x^3 = 5/8
x^3 = 5/8 // ^ 1/3
x = (5/8)^(1/3)
(x^2)/7 = 0
1/7*x^2 = 0 // : 1/7
x^2 = 0
x = 0
x in { (5/8)^(1/3), 0 }
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