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15*x^6-(x^2*((27*x^5)/3)) = 0
15*x^6-9*x^7 = 0
15*x^6-9*x^7 = 0
3*x^6*(5-3*x) = 0
5-3*x = 0 // - 5
-3*x = -5 // : -3
x = -5/(-3)
x = 5/3
3*x^6 = 0
3*x^6 = 0 // : 3
x^6 = 0
x = 0
x in { 5/3, 0 }
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