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y in (-oo:+oo)
y/21 < 3 // - 3
y/21-3 < 0
1/21*y-3 < 0 // + 3
1/21*y < 3 // : 1/21
y < 3/1/21
y < 63
y in (-oo:63)
(-oo:63)
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