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x in (-oo:+oo)
X-(4/6) = x/2 // - x/2
X-(x/2)-(4/6) = 0
X-(x/2)-2/3 = 0
X-1/2*x-2/3 = 0 // - X-2/3
-1/2*x = -(X-2/3) // : -1/2
x = (-(X-2/3))/(-1/2)
x = -2*(2/3-X)
x = -2*(2/3-X)
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