Question 1203252
d, sleeping
w, watching

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a person will devote 35 years to sleeping and watching TV. 
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{{{d+w=35}}}


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The number of years sleeping will exceed the number of years watching TV by 17. 
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{{{d-w=17}}}



This system, {{{system(d+w=35,d-w=17)}}}, can be easily and quickly solved by Elimination Method.