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m in (-oo:+oo)
m/13-7 < 11 // - 11
m/13-11-7 < 0
1/13*m-18 < 0 // + 18
1/13*m < 18 // : 1/13
m < 18/1/13
m < 234
m in (-oo:234)
(-oo:234)
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