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x in (-oo:+oo)
X^2 = -((9*x)/6)-1 // + -((9*x)/6)-1
X^2+(9*x)/6+1 = 0
X^2+3/2*x+1 = 0 // - X^2+1
3/2*x = -(X^2+1) // : 3/2
x = (-(X^2+1))/3/2
x = -2/3*(X^2+1)
x = -2/3*(X^2+1)
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