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m in (-oo:+oo)
18 = (2/3)*m // - (2/3)*m
18-((2/3)*m) = 0
(-2/3)*m+18 = 0
18-2/3*m = 0 // - 18
-2/3*m = -18 // : -2/3
m = -18/(-2/3)
m = 27
m = 27
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