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6*x^7-(((9*x^3)/3)*x^3) = 0
6*x^7-3*x^6 = 0
6*x^7-3*x^6 = 0
3*x^6*(2*x-1) = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
3*x^6 = 0
3*x^6 = 0 // : 3
x^6 = 0
x = 0
x in { 1/2, 0 }
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