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q in (-oo:+oo)
q*((5*q^2)/10)+15*q^2 = 0
1/2*q^3+15*q^2 = 0
q^2*(1/2*q+15) = 0
1/2*q+15 = 0 // - 15
1/2*q = -15 // : 1/2
q = -15/1/2
q = -30
q^2 = 0
1*q^2 = 0 // : 1
q^2 = 0
q = 0
q in { -30, 0 }
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