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x in (-oo:+oo)
(1/8)*x < 84 // - 84
(1/8)*x-84 < 0
1/8*x-84 < 0 // + 84
1/8*x < 84 // : 1/8
x < 84/1/8
x < 672
x in (-oo:672)
(-oo:672)
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