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m in (-oo:+oo)
(1/3)*m-5 = m // - m
(1/3)*m-m-5 = 0
-2/3*m-5 = 0 // + 5
-2/3*m = 5 // : -2/3
m = 5/(-2/3)
m = -15/2
m = -15/2
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