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Anonymous
10 + 3mm = 20
10 + 3x20 = 70
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70
3m + 15 = 45 3m = 30 m = 10
9m + 9m + 3m + 3m = 24m
6m + 20 = 9m - 4 24 = 3m m = 8
3m + 11n = 3
If 3m - 7 = 8, then m = 5