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5*x-((x^2)/30) = 0
5*x-1/30*x^2 = 0
DELTA = 5^2-(-1/30*0*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-5)/(-1/30*2) or x = (-25^(1/2)-5)/(-1/30*2)
x = 0 or x = 150
x in { 0, 150 }
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