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Yanshan 20 16, Grade 3, One Model Mathematics
If it is set to X channel, it is set to 10-x channel.

The column equation is 10x-5( 10-x)=70.

15x-50=70

15x= 120

x=8

10-8=2 (road)

Answer: Do 8 things right and 2 things wrong.

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