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y in (-oo:+oo)
(1/7)*y < 6 // - 6
(1/7)*y-6 < 0
1/7*y-6 < 0 // + 6
1/7*y < 6 // : 1/7
y < 6/1/7
y < 42
y in (-oo:42)
(-oo:42)
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