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x in (-oo:+oo)
(x^2)/63+(16*x)/63+1 = 0
1/63*x^2+16/63*x+1 = 0
DELTA = (16/63)^2-(1/63*1*4)
DELTA = 4/3969
DELTA > 0
x = ((4/3969)^(1/2)-16/63)/(1/63*2) or x = (-(4/3969)^(1/2)-16/63)/(1/63*2)
x = -7 or x = -9
x in { -9, -7 }
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