2/5m + 3/10m- 2/15m=1/6
2/5m+3/10m-2/15m=1/6
12/30m+9/30m-4/30m=1/6
21/30m-4/30m=1/6
17/30m=1/6
m=1/6:17/30
m=5/17
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2/5m+3/10m-2/15m=1/6
12/30m+9/30m-4/30m=1/6
21/30m-4/30m=1/6
17/30m=1/6
m=1/6:17/30
m=5/17