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14*x^7-(((16*x^3)/2)*x^3) = 0
14*x^7-8*x^6 = 0
14*x^7-8*x^6 = 0
2*x^6*(7*x-4) = 0
7*x-4 = 0 // + 4
7*x = 4 // : 7
x = 4/7
2*x^6 = 0
2*x^6 = 0 // : 2
x^6 = 0
x = 0
x in { 4/7, 0 }
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