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m in (-oo:+oo)
m-(7*m)-(21/6)+14/5 = 3 // - 3
m-(7*m)-(21/6)+14/5-3 = 0
m-7*m-7/2+14/5-3 = 0
-6*m-37/10 = 0 // + 37/10
-6*m = 37/10 // : -6
m = 37/10/(-6)
m = -37/60
m = -37/60
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