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m in (-oo:+oo)
(1/2)*m+7 = 13/2 // - 13/2
(1/2)*m-(13/2)+7 = 0
(1/2)*m-13/2+7 = 0
1/2*m+1/2 = 0 // - 1/2
1/2*m = -1/2 // : 1/2
m = -1/2/1/2
m = -1
m = -1
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