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m in (-oo:+oo)
14 = (2/3)*m // - (2/3)*m
14-((2/3)*m) = 0
(-2/3)*m+14 = 0
14-2/3*m = 0 // - 14
-2/3*m = -14 // : -2/3
m = -14/(-2/3)
m = 21
m = 21
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