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x = 10 + y
x^2 - y^2 = 9
(10+y)^2 - y^2 = 9
100 + 20y +y^2 -y^2 = 9
100 + 20y = 9
20y = -91
y = -91/20
x = 10 + y
= 10 - 91/20 =109/20