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u in (-oo:+oo)
-2*u = -2/9 // + -2/9
-2*u-(-2/9) = 0
2/9-2*u = 0
2/9-2*u = 0 // - 2/9
-2*u = -2/9 // : -2
u = -2/9/(-2)
u = 1/9
u = 1/9
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