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7a - 7a + 5a - 8a - 8b - 6b + 12b + 5c=
-3a -2b +5c
b) 35x + 26y - 40x - 25y + 16x - 12y =
35x - 40x +16x + 26y - 25y - 12y =
11x - 11y
c) 24a - 16b + 3c - 8b + 7a + 5c + 23b + 14a - 7c - 16a - 2c =
24a + 7a + 14a - 16a - 16b + 23b - 8b + 3c + 5c - 7c- 2c =
29a -1b -1c =
29a -b -c
d) 3a + ( a + 7b - 4c ) - ( 3a + 5b - 3c) - ( b - c ) =
3a + a + 7b - 4c -3a -5b + 3c -b +c =
3a + a -3a -5b -b + 7b - 4c + 3c +c =
1a + 1b + 0c =
a + b