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x in (-oo:+oo)
200*x-((x^2)/30) = 0
200*x-1/30*x^2 = 0
DELTA = 200^2-(-1/30*0*4)
DELTA = 40000
DELTA > 0
x = (40000^(1/2)-200)/(-1/30*2) or x = (-40000^(1/2)-200)/(-1/30*2)
x = 0 or x = 6000
x in { 0, 6000 }
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