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x in (-oo:+oo)
5/9 = x/18 // - x/18
5/9-(x/18) = 0
5/9-1/18*x = 0 // - 5/9
-1/18*x = -5/9 // : -1/18
x = -5/9/(-1/18)
x = 10
x = 10
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