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x in (-oo:+oo)
4/9 = x/13 // - x/13
4/9-(x/13) = 0
4/9-1/13*x = 0 // - 4/9
-1/13*x = -4/9 // : -1/13
x = -4/9/(-1/13)
x = 52/9
x = 52/9
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