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x - y = 14
x = 14 + y

x + y = 12
x = 12 - y

x = x
14 + y = 12 - y
14 - 12 = -y -y
2 = -2y
y = 2/-2
y = -1

x = 12 - y
x = 12 - (-1)
x = 12 + 1
x = 13