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