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M in (-oo:+oo)
M/(-6) > -14 // + 14
M/(-6)+14 > 0
14-1/6*M > 0 // - 14
-1/6*M > -14 // : -1/6
M < -14/(-1/6)
M < 84
M in (-oo:84)
(-oo:84)
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