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x in (-oo:+oo)
X-(x/2) = 4.5 // - 4.5
X-(x/2)-4.5 = 0
X-1/2*x-4.5 = 0 // - X-4.5
-1/2*x = -(X-4.5) // : -1/2
x = (-(X-4.5))/(-1/2)
x = -2*(4.5-X)
x = -2*(4.5-X)
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