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x in (-oo:+oo)
7/9-(x/8) = 7/72 // - 7/72
7/9-(x/8)-(7/72) = 0
7/9-(x/8)-7/72 = 0
49/72-1/8*x = 0 // - 49/72
-1/8*x = -49/72 // : -1/8
x = -49/72/(-1/8)
x = 49/9
x = 49/9
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