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m in (-oo:+oo)
-m/5 = 5/2 // - 5/2
-m/5-(5/2) = 0
-m/5-5/2 = 0
-1/5*m-5/2 = 0 // + 5/2
-1/5*m = 5/2 // : -1/5
m = 5/2/(-1/5)
m = -25/2
m = -25/2
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