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m in (-oo:+oo)
-9 = (2/3)*m // - (2/3)*m
-((2/3)*m)-9 = 0
(-2/3)*m-9 = 0
-2/3*m-9 = 0 // + 9
-2/3*m = 9 // : -2/3
m = 9/(-2/3)
m = -27/2
m = -27/2
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