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Foundations
hard
0:00.0
If
2
x
+
y
=
7
2x + y = 7
2
x
+
y
=
7
and
x
−
y
=
2
x - y = 2
x
−
y
=
2
, find
x
x
x
.
A
1
B
3
C
4
D
5
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