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For
x
2
+
x +
= 0
Then :
x
1
=
x
2
=
»
Variables Number:
2
3
4
For
x +
y
+
z
+
w
=
x +
y
+
z
+
w
=
x +
y +
z
+
w
=
x +
y +
z +
w =
⇒
x =
y =
z =
w =
