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q in (-oo:+oo)
q^3*((-6*q^4-(4*q^3))/9) = 0
q^3*((-6*q^4-4*q^3)/9) = 0
(q^3*(-6*q^4-4*q^3))/9 = 0
-6*q^4-4*q^3 = 0
-2*q^3*(3*q+2) = 0
3*q+2 = 0 // - 2
3*q = -2 // : 3
q = -2/3
-2*q^3*(q+2/3) = 0
(-2*q^3*q^3*(q+2/3))/9 = 0
( -2*q^3 )
-2*q^3 = 0 // : -2
q^3 = 0
q = 0
( q+2/3 )
q+2/3 = 0 // - 2/3
q = -2/3
( q^3 )
1*q^3 = 0 // : 1
q^3 = 0
q = 0
q in { 0, -2/3, 0 }
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