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Mathematics
Problem
How many solutions of the system
x
−
y
=
3
x-y=3
x
−
y
=
3
,
x
2
−
y
=
−
1
x^2-y=-1
x
2
−
y
=
−
1
are there such that both
x
x
x
and
y
y
y
are real?
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