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m in (-oo:+oo)
(-1/2)*m-5 = 9 // - 9
(-1/2)*m-9-5 = 0
-1/2*m-14 = 0 // + 14
-1/2*m = 14 // : -1/2
m = 14/(-1/2)
m = -28
m = -28
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