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x in (-oo:+oo)
-2*x-(4*x) = 2/9 // - 2/9
-2*x-(4*x)-(2/9) = 0
-2*x-4*x-2/9 = 0
-6*x-2/9 = 0 // + 2/9
-6*x = 2/9 // : -6
x = 2/9/(-6)
x = -1/27
x = -1/27
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