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Mathematics
Problem
The curve given by
x
2
+
x
y
+
y
2
=
7
x^{2}+x y + y^{2}=7
x
2
+
x
y
+
y
2
=
7
contains the point
(
2
,
1
)
(2,1)
(
2
,
1
)
. Determine the equation of the normal line to the curve at this point.
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