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m in (-oo:+oo)
m-(6*m)-(8/4)-(1/7) = 3 // - 3
m-(6*m)-(8/4)-(1/7)-3 = 0
m-6*m-1/7-3-2 = 0
-5*m-36/7 = 0 // + 36/7
-5*m = 36/7 // : -5
m = 36/7/(-5)
m = -36/35
m = -36/35
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