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y in (-oo:+oo)
y/8 >= 0.5 // - 0.5
y/8-0.5 >= 0
1/8*y-0.5 >= 0 // + 0.5
1/8*y >= 0.5 // : 1/8
y >= 0.5/1/8
y >= 4
y in <4:+oo)
<4:+oo)
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