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If you multiply your neighbor's age by 4, add 7, divide by 3, and subtract 9, the result is 20. how old is your neighbor?

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neighbour's age --- x

(4x+7)/3 - 9 = 20
times 3
4x+7 - 27 = 60
4x = 80
x=20
The neighbour is 20 years old

check:
times 4 --->80
add 7 ---->87
divide by 3 --> 29
subtract 9 ---> 20

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