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