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28*x^5-(((3*x)/7)*x) = 0
28*x^5+(-3/7)*x^2 = 0
28*x^5-3/7*x^2 = 0
x^2*(28*x^3-3/7) = 0
28*x^3 = 3/7 // : 28
x^3 = 3/196
x^3 = 3/196 // ^ 1/3
x = (3/196)^(1/3)
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { (3/196)^(1/3), 0 }
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