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m in (-oo:+oo)
7*m+1 = 9/2 // - 9/2
7*m-(9/2)+1 = 0
7*m-9/2+1 = 0
7*m-7/2 = 0 // + 7/2
7*m = 7/2 // : 7
m = 7/2/7
m = 1/2
m = 1/2
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