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m in (-oo:+oo)
3/5-m+12 = m/2 // - m/2
3/5-m-(m/2)+12 = 0
63/5-3/2*m = 0 // - 63/5
-3/2*m = -63/5 // : -3/2
m = -63/5/(-3/2)
m = 42/5
m = 42/5
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