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= 7a + 4b - 8a + 6b
= 7a - 8a + 4b + 6b
= -a + 10b
4.(16a - 12b + 4c) + (5a - 9b + 2c)
= 16a - 12b + 4c + 5a - 9b + 2c
= 16a + 5a - 12b - 9b + 4c + 2c
= 21a -21b + 6c
7a +4b -8a +6b
7a -8a +4b +6b
-a +10b
4. (16a -12b +4c) +(5a -9b +2c)
16a -12b +4c +5a -9b +2c
16a +5a -12b -9b +4c +2c
21a -21b +6c