April 2019 1 30 Report
1. (7a + 4b) + (8a - 6b) =......
2. (15i + 14b + 13k) + (-30i - 45j + 51k)=.....
3. (42n + 35m + 7) - (50m - 20n + 9)=.....
4. (5x + 3) = x-1
5. 6x + 4 = x -y
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