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(x^4)/12-(18*x) = 0
(x^4)/12-18*x = 0
1/12*x^4-18*x = 0
x*(1/12*x^3-18) = 0
1/12*x^3 = 18 // : 1/12
x^3 = 216
x^3 = 216 // ^ 1/3
x = 6
x = 0
x = 0
x in { 6, 0 }
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