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x in (-oo:+oo)
10/12 = x/9 // - x/9
10/12-(x/9) = 0
5/6-1/9*x = 0 // - 5/6
-1/9*x = -5/6 // : -1/9
x = -5/6/(-1/9)
x = 15/2
x = 15/2
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