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y in (-oo:+oo)
y/10 > 4 // - 4
y/10-4 > 0
1/10*y-4 > 0 // + 4
1/10*y > 4 // : 1/10
y > 4/1/10
y > 40
y in (40:+oo)
(40:+oo)
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