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m in (-oo:+oo)
2-6*m = -8/5 // + -8/5
2-6*m-(-8/5) = 0
8/5-6*m+2 = 0
18/5-6*m = 0 // - 18/5
-6*m = -18/5 // : -6
m = -18/5/(-6)
m = 3/5
m = 3/5
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