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m in (-oo:+oo)
12-m-(3/5) = m/2 // - m/2
12-m-(m/2)-(3/5) = 0
12-m-(m/2)-3/5 = 0
57/5-3/2*m = 0 // - 57/5
-3/2*m = -57/5 // : -3/2
m = -57/5/(-3/2)
m = 38/5
m = 38/5
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