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