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m in (-oo:+oo)
(-1/3)*m-2 = 4 // - 4
(-1/3)*m-4-2 = 0
-1/3*m-6 = 0 // + 6
-1/3*m = 6 // : -1/3
m = 6/(-1/3)
m = -18
m = -18
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