Answer:
a=23,b=7,c=15,d=9
Explanation:
look at the top left - bottom right diagonal, the sum:
8+16+24 = 48
a=48-8-17 = 23
b=48-25-16 = 7
c=48-8-25 = 15
d=48-16-a=48-16-23=9
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