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m in (-oo:+oo)
(1/2)*m+6 = 15/2 // - 15/2
(1/2)*m-(15/2)+6 = 0
(1/2)*m-15/2+6 = 0
1/2*m-3/2 = 0 // + 3/2
1/2*m = 3/2 // : 1/2
m = 3/2/1/2
m = 3
m = 3
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