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m in (-oo:+oo)
m-(4*m)-(20/6)-(19/7) = 1 // - 1
m-(4*m)-(20/6)-(19/7)-1 = 0
m-4*m-10/3-19/7-1 = 0
-3*m-148/21 = 0 // + 148/21
-3*m = 148/21 // : -3
m = 148/21/(-3)
m = -148/63
m = -148/63
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