Answer:
-6a -13b - 12c + 4
Explanation:
-12a + -5b - 12c + 6a - 8b - (-4)
-12a + -5b - 12c + 6a - 8b + 4 [a "- -" = +]
(-12a + 6a) -(5b -8b) - 12c + 4 [Group like terms.]
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