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x in (-oo:+oo)
7*x-(4/5) < 16 // - 16
7*x-(4/5)-16 < 0
7*x-4/5-16 < 0
7*x-84/5 < 0 // + 84/5
7*x < 84/5 // : 7
x < 84/5/7
x < 12/5
x in (-oo:12/5)
(-oo:12/5)
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