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y in (-oo:+oo)
(-5/7)*y < 20 // - 20
(-5/7)*y-20 < 0
-5/7*y-20 < 0 // + 20
-5/7*y < 20 // : -5/7
y > 20/(-5/7)
y > -28
y in (-28:+oo)
(-28:+oo)
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