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m in (-oo:+oo)
1/2+8 = (-1/2)*m // - (-1/2)*m
1/2-((-1/2)*m)+8 = 0
(1/2)*m+1/2+8 = 0
1/2*m+17/2 = 0 // - 17/2
1/2*m = -17/2 // : 1/2
m = -17/2/1/2
m = -17
m = -17
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