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x in (-oo:+oo)
x/9-(x/8) = 7/9 // - 7/9
x/9-(x/8)-(7/9) = 0
x/9-(x/8)-7/9 = 0
-1/72*x-7/9 = 0 // + 7/9
-1/72*x = 7/9 // : -1/72
x = 7/9/(-1/72)
x = -56
x = -56
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