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m in (-oo:+oo)
(1/2)*m = 3+5 // - 3+5
(1/2)*m-5-3 = 0
1/2*m-8 = 0 // + 8
1/2*m = 8 // : 1/2
m = 8/1/2
m = 16
m = 16
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