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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-4/9 = 0 // + 4/9
-x = 4/9 // * -1
x = -4/9
x = -4/9
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