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m in (-oo:+oo)
2*m+9 = 39/4 // - 39/4
2*m-(39/4)+9 = 0
2*m-39/4+9 = 0
2*m-3/4 = 0 // + 3/4
2*m = 3/4 // : 2
m = 3/4/2
m = 3/8
m = 3/8
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