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Divisibility
medium
0:00.0
If
x
2
−
y
2
=
7
x^2 - y^2 = 7
x
2
−
y
2
=
7
for positive integers
x
,
y
x, y
x
,
y
, what is
x
x
x
?
A
2
2
2
B
3
3
3
C
4
4
4
D
5
5
5
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