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y in (-oo:+oo)
13 > 8-((1/7)*y) // - 8-((1/7)*y)
(1/7)*y-8+13 > 0
1/7*y+5 > 0 // - 5
1/7*y > -5 // : 1/7
y > -5/1/7
y > -35
y in (-35:+oo)
(-35:+oo)
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