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Theory of equations
Question
If
7
log
7
x
2
−
4
x
+
5
=
x
−
1
,
x
may have value
Moderate
Solution
We have
7
log
7
x
2
−
4
x
+
5
=
x
−
1
⇒
x
2
−
4
x
+
5
=
x
−
1
⇒
x
2
−
5
x
+
6
=
x
−
1
⇒
x
=
2
,
3
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