Jawabanmu

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2014-08-29T16:36:22+07:00
42n + 35m + 7 -50m + 20n - 9 = 

42n + 20n + 35m - 50m + 7 - 9 = 62n -15m - 2
2 3 2
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2014-08-29T16:42:21+07:00
42n + 20n + 35m - 50m +7-9
= 62n - 15m - 2