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6*x-((1/6)*x^2)-x = 0
(-1/6)*x^2+6*x-x = 0
5*x-1/6*x^2 = 0
DELTA = 5^2-(-1/6*0*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-5)/(-1/6*2) or x = (-25^(1/2)-5)/(-1/6*2)
x = 0 or x = 30
x in { 0, 30 }
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