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y in (-oo:+oo)
8-((2/5)*y) < 10 // - 10
8-((2/5)*y)-10 < 0
(-2/5)*y-10+8 < 0
-2/5*y-2 < 0 // + 2
-2/5*y < 2 // : -2/5
y > 2/(-2/5)
y > -5
y in (-5:+oo)
(-5:+oo)
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