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a=1
b+1/c+1/d+1=17/13
13/13+1/c+1/d+1=17/13
13/13=b=1
1/c+1/d+1=17/13-13/13=4/13
c+1/d+1=13/4
d+1=4
d=3
c=13/4-1/4=12/4=3
maaf caranya berantakan
jelas bahwa a = b = 1 dan c = d = 3