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m in (-oo:+oo)
m-(5*m)-(17/4)-(21/7) = 0
m-5*m-17/4-3 = 0
-4*m-29/4 = 0 // + 29/4
-4*m = 29/4 // : -4
m = 29/4/(-4)
m = -29/16
m = -29/16
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