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