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q in (-oo:+oo)
2*q^2+(40/4)*q^2+18*q-(4*q)-80 = 0
2*q^2+(40/4)*q^2+18*q-4*q-80 = 0
12*q^2+14*q-80 = 0
DELTA = 14^2-(-80*4*12)
DELTA = 4036
DELTA > 0
q = (4036^(1/2)-14)/(2*12) or q = (-4036^(1/2)-14)/(2*12)
q = (2*1009^(1/2)-14)/24 or q = (-2*1009^(1/2)-14)/24
q in { (-2*1009^(1/2)-14)/24, (2*1009^(1/2)-14)/24 }
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