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x = 3y

1/x + 1/y = 4

Therefore

1/(3y) + 1/y = 4

or

1/(3y) +3/(3y) = 4

4/(3y) = 4

3y = 1

y = 1/3

since x = 3y, x = 1

y = 1/3; x = 1

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