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x in (-oo:+oo)
2/9 = x/13 // - x/13
2/9-(x/13) = 0
2/9-1/13*x = 0 // - 2/9
-1/13*x = -2/9 // : -1/13
x = -2/9/(-1/13)
x = 26/9
x = 26/9
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