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