Jawabanmu

2014-08-21T19:39:29+07:00
A. -3m + 4n - 6 + (7n - 8m + 10)
    -3m + 4n - 6 + 7n - 8m + 10
    (-3m - 8m ) + (4n + 7n ) - 6 + 10
     - 11m + 11 n + 4

b. 15a + 7b - 5c + (-11a -12b+13d )
    15a - 11a + 7b - 12b - 5c + 13d
    4a - 5b - 5c +13
2014-08-21T19:40:43+07:00