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Junior high school mathematics application problem: solve the urgent need with standardized and detailed process and equation! ! !
1. let each type a machine produce x pieces every day, and type b machine produce (x- 1) pieces.

(5x-4)/8 =(7(x- 1)- 1)/ 1 1

x=20

So each box has (5*20-4)/8= 12.

2. Let the students leave the team for x hours.

(7.5-5)x=5* 1*2

x=4

So the distance = 5 * 4+2.5 = 22.5km.

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