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x + 2 = y ........X = Y - 2
y = 4 - x
Y = 4 - ( Y - 2)
Y = 4 - Y + 2
Y + Y = 4 + 2
2Y = 6
Y = 6/2 = 3
X = Y - 2
X = 3 - 2 = 1
X = 1, Y = 3