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d in (-oo:+oo)
d/3 < 7 // - 7
d/3-7 < 0
1/3*d-7 < 0 // + 7
1/3*d < 7 // : 1/3
d < 7/1/3
d < 21
d in (-oo:21)
(-oo:21)
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