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x in (-oo:+oo)
7*x-(7/8) = 665/8 // - 665/8
7*x-(7/8)-(665/8) = 0
7*x-7/8-665/8 = 0
7*x-84 = 0 // + 84
7*x = 84 // : 7
x = 84/7
x = 12
x = 12
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