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Answer:
-x - 24
Step-by-step explanation:
first term expansion
(5x-4) ^ 4
(5x -4) (5x-4) (5x-4) (5x-4)
25x - 20 - 20x + 16 + 25x -20-20x + 16
Second term expansion.
25x -20x - 20x + 25x -20 -20 + 16
third term expansion
-25x + 25x -20-20 +16
-x - 24..