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m in (-oo:+oo)
(1/2)*m+3/2 = 5 // - 5
(1/2)*m+3/2-5 = 0
1/2*m-7/2 = 0 // + 7/2
1/2*m = 7/2 // : 1/2
m = 7/2/1/2
m = 7
m = 7
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