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(x^2)/64+12 = x // - x
(x^2)/64-x+12 = 0
1/64*x^2-x+12 = 0
DELTA = (-1)^2-(1/64*4*12)
DELTA = 1/4
DELTA > 0
x = ((1/4)^(1/2)+1)/(1/64*2) or x = (1-(1/4)^(1/2))/(1/64*2)
x = 48 or x = 16
x in { 16, 48 }
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