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