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Foundations
hard
0:00.0
Solve
2
x
+
y
=
7
2x + y = 7
2
x
+
y
=
7
and
x
−
y
=
2
x - y = 2
x
−
y
=
2
for
x
x
x
.
A
2
2
2
B
3
3
3
C
4
4
4
D
5
5
5
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