September 2018 2 28 Report
1. (13a - 8b) + (12a + 9b)
2. (15j + 14b + 13k) + (-30i - 45j + 51k)
3. hasil penjumlahan (3 - 17x + 35z) dan (4x + 23y - 9)
4. (42n + 35m + 7) -(50m - 20n + 9)

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