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m in (-oo:+oo)
(10/8)*m-((7/8)*m)+18 = (3/8)*m+25 // - (3/8)*m+25
(10/8)*m-((7/8)*m)-((3/8)*m)-25+18 = 0
(10/8)*m+(-7/8)*m+(-3/8)*m-25+18 = 0
-7 = 0
m belongs to the empty set
m belongs to the empty set
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