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m in (-oo:+oo)
6*(-3*m-4) = 48 // - 48
6*(-3*m-4)-48 = 0
6*(-3*m-4)-48 = 0
-18*m-72 = 0
-18*m-72 = 0
-18*m-72 = 0 // + 72
-18*m = 72 // : -18
m = 72/(-18)
m = -4
m = -4
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