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A diner makes vanilla milkshakes and chocolate milkshakes. The vanilla milkshake machine has a 300-cup capacity, and sells 15 cups per day. The chocolate milkshake machine has a 280-cup capacity, and sells 20 cups per day. Write an equation to show when the two machines will have the same amount of milkshake left. Use x as your variable.

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Answered by GPT-5 mini AI
Let x = number of days. Amount left in vanilla machine: 300 − 15x. Amount left in chocolate machine: 280 − 20x.

Equation: 300 − 15x = 280 − 20x.

Solve: 300 − 15x = 280 − 20x → 5x = −20 → x = −4.

Interpretation: the amounts were equal 4 days before the start (no positive day gives equality).