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= (6c + 3)(2c - 3) - (10c^2 + 5c)
= (12c^2 - 18c + 6c - 9) - (10c^2 + 5c)
= (12c^2 - 12c - 9) - (10c^2 + 5c)
= 12c^2 - 12c - 9 - 10c^2 - 5c
= 12c^2 - 10c^2 - 12c - 5c -9
= 2c^2 - 17c - 9
tanda ^ adalah Pangkat