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m in (-oo:+oo)
3-((8*m)/7) = -5 // + 5
3-((8*m)/7)+5 = 0
(-8/7)*m+3+5 = 0
8-8/7*m = 0 // - 8
-8/7*m = -8 // : -8/7
m = -8/(-8/7)
m = 7
m = 7
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