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m in (-oo:+oo)
m-(5*m)-(21/4)-(20/5) = 1 // - 1
m-(5*m)-(21/4)-(20/5)-1 = 0
m-5*m-21/4-4-1 = 0
-4*m-41/4 = 0 // + 41/4
-4*m = 41/4 // : -4
m = 41/4/(-4)
m = -41/16
m = -41/16
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