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x-((x/6)*x)-(((5/2)*x)/5) = 0
(-1/6)*x^2+x+(-1/2)*x = 0
1/2*x-1/6*x^2 = 0
DELTA = (1/2)^2-(-1/6*0*4)
DELTA = 1/4
DELTA > 0
x = ((1/4)^(1/2)-1/2)/(-1/6*2) or x = (-(1/4)^(1/2)-1/2)/(-1/6*2)
x = 0 or x = 3
x in { 0, 3 }
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