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m in (-oo:+oo)
(1/2)*m = -11/2 // + -11/2
(1/2)*m-(-11/2) = 0
(1/2)*m+11/2 = 0
1/2*m+11/2 = 0 // - 11/2
1/2*m = -11/2 // : 1/2
m = -11/2/1/2
m = -11
m = -11
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