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x in (-oo:+oo)
3*(5/2)*x^7 = 6*x // - 6*x
3*(5/2)*x^7-(6*x) = 0
3*(5/2)*x^7-6*x = 0
15/2*x^7-6*x = 0
3*x*(5/2*x^6-2) = 0
5/2*x^6 = 2 // : 5/2
x^6 = 4/5
x^6 = 4/5 // ^ 1/6
abs(x) = (4/5)^(1/6)
x = (4/5)^(1/6) or x = -(4/5)^(1/6)
3*x = 0
3*x = 0 // : 3
x = 0
x in { (4/5)^(1/6), -(4/5)^(1/6), 0 }
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