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The correct equation to show when the two popcorn machines will have the same amount of popcorn left is:
120 - 7x = 150 - 9x
Solving for x:
120 - 7x = 150 - 9x
2x = 30
x = 15
Therefore, the two popcorn machines will have the same amount of popcorn left after 15 hours. The correct response is:
120-7x=150-9x ; x=15