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18*x-((3/2)*x^2) = 0
(-3/2)*x^2+18*x = 0
18*x-3/2*x^2 = 0
DELTA = 18^2-(-3/2*0*4)
DELTA = 324
DELTA > 0
x = (324^(1/2)-18)/(-3/2*2) or x = (-324^(1/2)-18)/(-3/2*2)
x = 0 or x = 12
x in { 0, 12 }
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