7(5c+2)+3(1-c) при c=5;0;

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Some  people can overcome pain- some of them can walk across  burning coals or sleep on beds of nails. How do you think this can be ?

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The guinea pig
2)When did people begin to use this animal?
3)How(what for) did people use this animal?

4)What has changed in the course of time?

5)How is the animal used now?