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m in (-oo:+oo)
2*m-(1/4) = 5 // - 5
2*m-(1/4)-5 = 0
2*m-1/4-5 = 0
2*m-21/4 = 0 // + 21/4
2*m = 21/4 // : 2
m = 21/4/2
m = 21/8
m = 21/8
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