Solve the equations 24 / (x + y) + 24 / (X-Y) = 7 / 3, 8 / (x + y) + 18 / (X-Y) = 4 / 3

Because 8 / (x + y) + 18 / (X-Y) = 4 / 3, multiply both sides by 3
24/(x+y) +54/(x-y) = 4
Subtract both sides at the same time
24/(x+y) +24/(x-y) = 7/3
have to
30/(x-y) = 5/3
So X-Y = 18
Substituting
8/(x+y) +18/(x-y) = 4/3
We get x + y = 24
So x = 21, y = 3
Thank you for your adoption^_^

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