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x in (-oo:+oo)
x/7-(x/14)+9 = x-9 // - x-9
x/7-(x/14)-x+9+9 = 0
18-13/14*x = 0 // - 18
-13/14*x = -18 // : -13/14
x = -18/(-13/14)
x = 252/13
x = 252/13
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