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x - y = 8
x = 16 - y
16 - y - y = 8
x = 16-y
-2y = 8 - 16
x = 16-y
-2y = - 8 |(-2)
x = 16-y
y = 4
x=16 - 4
y = 4
x = 12
y = 4
12 i 4