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q in (-oo:+oo)
q*((3*q^3-(6*q))/3) = 0
q*((3*q^3-6*q)/3) = 0
(q*(3*q^3-6*q))/3 = 0
3*q^3-6*q = 0
3*q*(q^2-2) = 0
1*q^2 = 2 // : 1
q^2 = 2
q^2 = 2 // ^ 1/2
abs(q) = 2^(1/2)
q = 2^(1/2) or q = -2^(1/2)
3*q*(q-2^(1/2))*(q+2^(1/2)) = 0
(3*q*q*(q-2^(1/2))*(q+2^(1/2)))/3 = 0
( 3*q )
3*q = 0 // : 3
q = 0
( q+2^(1/2) )
q+2^(1/2) = 0 // - 2^(1/2)
q = -2^(1/2)
( q-2^(1/2) )
q-2^(1/2) = 0 // + 2^(1/2)
q = 2^(1/2)
( q )
q = 0
q in { 0, -2^(1/2), 2^(1/2), 0 }
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