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m in (-oo:+oo)
6*(4-4*m) = -120 // + 120
6*(4-4*m)+120 = 0
6*(4-4*m)+120 = 0
144-24*m = 0
144-24*m = 0
144-24*m = 0 // - 144
-24*m = -144 // : -24
m = -144/(-24)
m = 6
m = 6
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