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m in (-oo:+oo)
12 = (2*m)/3-4 // - (2*m)/3-4
4-((2*m)/3)+12 = 0
(-2/3)*m+4+12 = 0
16-2/3*m = 0 // - 16
-2/3*m = -16 // : -2/3
m = -16/(-2/3)
m = 24
m = 24
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