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The first mathematical application problem (equation solution) (solution process and analysis explanation)
For example, 60 points x and a *** 10, then 80 points is10-x.

The second corner of 7 yuan is 720 yuan.

So 60x+80( 10-x)=720.

60x+800-80x=720

80x-60x=800-720

20x=80

x=4

10-x= 10-4=6

A: Four sixties and six eighties.

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