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