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