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m in (-oo:+oo)
12/5-((3/8)*m) = 3 // - 3
12/5-((3/8)*m)-3 = 0
(-3/8)*m+12/5-3 = 0
-3/8*m-3/5 = 0 // + 3/5
-3/8*m = 3/5 // : -3/8
m = 3/5/(-3/8)
m = -8/5
m = -8/5
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