(x + 8 17/36) +7 31/36 = 25 1/36

(x + 8 17/36) = 25 1/36 - 7 31/36                 

(x + 8 17/36) = 24 37/36 - 7 31/36

(x + 8 17/36) = 17 6/36

x = 17 6/36 - 8 17/36

x = 16 42/36 - 8 17/36

x = 8  25/36

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(8 25/36 + 8 17/6) + 7 31/36 = 25 1/36

12 13/45 - ( y - 5 17/45) = 3 23/45

(y-5 17/45) = 12 13/45 - 3 23/45

(y-5 17/45) = 11 58/45 - 3 23/45

(y-5 17/45) = 8 35/45

y = 8 35/45 + 5 17/45

y = 13 52/45

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12 13/45 - ( 13 52/45 - 5 17/45) = 3 23/45