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q in (-oo:+oo)
5 = (-1/5)*q^2 // - (-1/5)*q^2
5-((-1/5)*q^2) = 0
(1/5)*q^2+5 = 0
1/5*q^2 = -5 // : 1/5
q^2 = -25
q belongs to the empty set
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