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16x + 15y =1
x= (1 - 15y) / 16
32(1 - 15y)/16 - 25y = 13
2(1 - 15y) - 25y = 13
2 - 30y - 25y = 13
-55y = 13 - 2
-55 y = 11
y = - 11/55
y = -1/5