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Q in (-oo:+oo)
6*Q-((Q^2)/200) = 0
6*Q-1/200*Q^2 = 0
DELTA = 6^2-(-1/200*0*4)
DELTA = 36
DELTA > 0
Q = (36^(1/2)-6)/(-1/200*2) or Q = (-36^(1/2)-6)/(-1/200*2)
Q = 0 or Q = 1200
Q in { 0, 1200 }
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