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m in (-oo:+oo)
m-(7*m)-(12/3)+19/5 = 3 // - 3
m-(7*m)-(12/3)+19/5-3 = 0
m-7*m+19/5-4-3 = 0
-6*m-16/5 = 0 // + 16/5
-6*m = 16/5 // : -6
m = 16/5/(-6)
m = -8/15
m = -8/15
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