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m in (-oo:+oo)
3*m+1 = 23/8 // - 23/8
3*m-(23/8)+1 = 0
3*m-23/8+1 = 0
3*m-15/8 = 0 // + 15/8
3*m = 15/8 // : 3
m = 15/8/3
m = 5/8
m = 5/8
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