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x in (-oo:+oo)
X+4/9 = 2*x // - 2*x
X-(2*x)+4/9 = 0
X-2*x+4/9 = 0
X-2*x+4/9 = 0 // - X+4/9
-2*x = -(X+4/9) // : -2
x = (-(X+4/9))/(-2)
x = (X+4/9)/2
x = (X+4/9)/2
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