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m in (-oo:+oo)
m-(7*m)-(15/5)+14/7 = 3 // - 3
m-(7*m)-(15/5)+14/7-3 = 0
m-7*m+14/7-3-3 = 0
-6*m-4 = 0 // + 4
-6*m = 4 // : -6
m = 4/(-6)
m = -2/3
m = -2/3
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