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