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x in (-oo:+oo)
8/9 = x/72 // - x/72
8/9-(x/72) = 0
8/9-1/72*x = 0 // - 8/9
-1/72*x = -8/9 // : -1/72
x = -8/9/(-1/72)
x = 64
x = 64
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