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15a+3b
b. 12+8a-6
12-6+8a
6+8a
c.5a+8a+8+3
13a+13
d. 6a-5b-2c -8a+6b+c
6a-8a-5b+6b-2c-c
-2a+b-3c
e. (9a+12) - (7a+14)
9a+12-7a-14
9a-7a+12-14
2a-2