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m in (-oo:+oo)
m-(7*m)-(23/5)-(18/4) = 3 // - 3
m-(7*m)-(23/5)-(18/4)-3 = 0
m-7*m-23/5-9/2-3 = 0
-6*m-121/10 = 0 // + 121/10
-6*m = 121/10 // : -6
m = 121/10/(-6)
m = -121/60
m = -121/60
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