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x in (-oo:+oo)
x/7-1 > x/8 // - x/8
x/7-(x/8)-1 > 0
1/56*x-1 > 0 // + 1
1/56*x > 1 // : 1/56
x > 1/1/56
x > 56
x in (56:+oo)
(56:+oo)
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