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12.3.1.8 Algebraic
Problem: Find the sum of natural values of the parameter
a
, for each of which the system has at least one solution
{
(
x
−
a
)
2
+
(
y
+
3
)
2
+
(
x
+
2
)
2
+
(
y
−
a
)
2
=
=
2
a
2
+
10
a
+
13
y
=
a
2
−
4
a
−
6
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