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y in (-oo:+oo)
-2*y > 1/7 // - 1/7
-2*y-(1/7) > 0
-2*y-1/7 > 0
-2*y-1/7 > 0 // + 1/7
-2*y > 1/7 // : -2
y < 1/7/(-2)
y < -1/14
y in (-oo:-1/14)
(-oo:-1/14)
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