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