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