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m in (-oo:+oo)
2*m-6 = m/2+12 // - m/2+12
2*m-(m/2)-12-6 = 0
3/2*m-18 = 0 // + 18
3/2*m = 18 // : 3/2
m = 18/3/2
m = 12
m = 12
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