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m in (-oo:+oo)
m/13 > -6 // + 6
m/13+6 > 0
1/13*m+6 > 0 // - 6
1/13*m > -6 // : 1/13
m > -6/1/13
m > -78
m in (-78:+oo)
(-78:+oo)
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