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When 40 is added to the number of miles Karen ran last week, the result is the same as adding 10 to 4 times the number of miles she ran last week. How many miles did Karen run last week? 

Sagot :

0000000id
x+40=4x+10
4x-x=40-10
3x=30
x=10 miles

Answer: 10 miles

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