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m in (-oo:+oo)
8-4*m = 28/5 // - 28/5
8-4*m-(28/5) = 0
8-4*m-28/5 = 0
12/5-4*m = 0 // - 12/5
-4*m = -12/5 // : -4
m = -12/5/(-4)
m = 3/5
m = 3/5
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