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m in (-oo:+oo)
-7/8 < ((-m)^13)/8 // - ((-m)^13)/8
-(((-m)^13)/8)-7/8 < 0
(1/8)*m^13-7/8 < 0
1/8*m^13 < 7/8
1/8*m^13 < 7/8 // : 1/8
m^13 < 7/8/1/8
m^13 < 7
m^13 < 7 // ^ 1/13
m < 7^(1/13)
m in (-oo:7^(1/13))
m in (-oo:7^(1/13))
(-oo:7^(1/13))
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