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18*x^7-(((12*x^3)/2)*x^3) = 0
18*x^7-6*x^6 = 0
18*x^7-6*x^6 = 0
6*x^6*(3*x-1) = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
6*x^6 = 0
6*x^6 = 0 // : 6
x^6 = 0
x = 0
x in { 1/3, 0 }
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