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m in (-oo:+oo)
5*m+1/2 = 121/2 // - 121/2
5*m+1/2-(121/2) = 0
5*m+1/2-121/2 = 0
5*m-60 = 0 // + 60
5*m = 60 // : 5
m = 60/5
m = 12
m = 12
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