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(-3c4 - 5c2 - 7c) + (4c4 + 8c3 + 2c2) =
c4 + 8c3 - 3c2 - 7c
(-m2 + 6) + (-4m2 + 7m + 2) =
-5m2 + 7m + 8
(-5n4 + 8) + (5n4 + 8n3+ 3n2) =
8n3 + 3n2 + 8
(-x3 - x) + (6x2 + 6x -7) =
-x3 + 6x2 + 5x - 7