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q in (-oo:+oo)
q^2*((2/4)*q-12) = 0
q^2*(1/2*q-12) = 0
( 1/2*q-12 )
1/2*q-12 = 0 // + 12
1/2*q = 12 // : 1/2
q = 12/1/2
q = 24
( q^2 )
1*q^2 = 0 // : 1
q^2 = 0
q = 0
q in { 24, 0 }
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