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6*x-((x^2)/100)-(2*x) = 0
6*x-((x^2)/100)-2*x = 0
4*x-1/100*x^2 = 0
DELTA = 4^2-(-1/100*0*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)-4)/(-1/100*2) or x = (-16^(1/2)-4)/(-1/100*2)
x = 0 or x = 400
x in { 0, 400 }
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