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y in (-oo:+oo)
21 > (7/2)*y // - (7/2)*y
21-((7/2)*y) > 0
(-7/2)*y+21 > 0
21-7/2*y > 0 // - 21
-7/2*y > -21 // : -7/2
y < -21/(-7/2)
y < 6
y in (-oo:6)
(-oo:6)
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