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x - y = 2
--------------- -
2y = 8
y = 8/2
y = 4
x +y = 10
x + 4 = 10
x = 10 - 4
x = 6
x= 6
y =4
X-X+Y+Y = -2+10
2Y = 8
Y = 8/2
Y= 4