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d in (-oo:+oo)
d/12-6 < 1 // - 1
d/12-6-1 < 0
1/12*d-7 < 0 // + 7
1/12*d < 7 // : 1/12
d < 7/1/12
d < 84
d in (-oo:84)
(-oo:84)
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