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m in (-oo:+oo)
m-(7*m)-(22/6)-(21/7) = 1 // - 1
m-(7*m)-(22/6)-(21/7)-1 = 0
m-7*m-11/3-3-1 = 0
-6*m-23/3 = 0 // + 23/3
-6*m = 23/3 // : -6
m = 23/3/(-6)
m = -23/18
m = -23/18
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