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