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2014-03-20T15:48:16-03:00
4m+3=m+9
4m-m=9-3
3m=6
m=6/3=2
3 5 3
2014-03-20T15:48:39-03:00
4m + 3 = m + 9
4m = m + 6
3m = 6
m = 6/3 = 2.
1 5 1