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x in (-oo:+oo)
x*((14*x^2)/10)-(((125*x)/35)*x^4)+5*50*x^3 = 0
(-25/7)*x^5+x*((14*x^2)/10)+5*50*x^3 = 0
1257/5*x^3-25/7*x^5 = 0
x^3*(1257/5-25/7*x^2) = 0
-25/7*x^2 = -1257/5 // : -25/7
x^2 = 8799/125
x^2 = 8799/125 // ^ 1/2
abs(x) = (8799/125)^(1/2)
x = (8799/125)^(1/2) or x = -(8799/125)^(1/2)
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { (8799/125)^(1/2), -(8799/125)^(1/2), 0 }
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