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bilangan pertama = 8
bilangan kedua = 8 + 9 = 17
bil 2 = y
x+y = 25
x-y = 9 -
2y = 16
y = 8
cari x
x+y = 25
x + 8 = 25
x=25-8 = 17
maka {x,y} = {17,8}