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m in (-oo:+oo)
(1/3)*m+7*m-3/8 = 871/24 // - 871/24
(1/3)*m+7*m-3/8-(871/24) = 0
(1/3)*m+7*m-3/8-871/24 = 0
22/3*m-110/3 = 0 // + 110/3
22/3*m = 110/3 // : 22/3
m = 110/3/22/3
m = 5
m = 5
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