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