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m in (-oo:+oo)
4*m-((25/2)*m)-5 = 0
4*m+(-25/2)*m-5 = 0
-17/2*m-5 = 0 // + 5
-17/2*m = 5 // : -17/2
m = 5/(-17/2)
m = -10/17
m = -10/17
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