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-13a+6-4c-11+5a-2c
Combine the red terms. They are like terms because they both have
a's: -13a+5a = -8a.
Combine the purple terms. They are like terms because they both are just
plain numbers with no letter: +6-11 = -5.
Combine the green terms. They are like terms because they both have
c's: -4c-2c = -6c.
Final answer:
-8a-5-6c.
Edwin
