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D( q )
q+3 = 0
q+3 = 0
q+3 = 0
q+3 = 0 // - 3
q = -3
q in (-oo:-3) U (-3:+oo)
(q-2)/3 = (q-1)/(q+3) // - (q-1)/(q+3)
(q-2)/3-((q-1)/(q+3)) = 0
(q-2)/3+(-1*(q-1))/(q+3) = 0
((q-2)*(q+3))/(3*(q+3))+(-1*3*(q-1))/(3*(q+3)) = 0
(q-2)*(q+3)-1*3*(q-1) = 0
q^2-2*q-3 = 0
q^2-2*q-3 = 0
q^2-2*q-3 = 0
DELTA = (-2)^2-(-3*1*4)
DELTA = 16
DELTA > 0
q = (16^(1/2)+2)/(1*2) or q = (2-16^(1/2))/(1*2)
q = 3 or q = -1
(q+1)*(q-3) = 0
((q+1)*(q-3))/(3*(q+3)) = 0
((q+1)*(q-3))/(3*(q+3)) = 0 // * 3*(q+3)
(q+1)*(q-3) = 0
( q+1 )
q+1 = 0 // - 1
q = -1
( q-3 )
q-3 = 0 // + 3
q = 3
q in { -1, 3 }
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