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m in (-oo:+oo)
6*(-(3*m)-2) = -228 // + 228
6*(-(3*m)-2)+228 = 0
6*(-3*m-2)+228 = 0
6*(-3*m-2)+228 = 0
216-18*m = 0
216-18*m = 0
216-18*m = 0 // - 216
-18*m = -216 // : -18
m = -216/(-18)
m = 12
m = 12
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