Answer :
The excluded value of x for the given expression is 6.
What are Rational numbers?
In arithmetic, a rational number is a number that can be expressed as the quotient p/q of two numbers with q≠0.
As 1 / (x - 6) is a rational number (Given)
(x - 6) ≠ 0 (according to definition of Rational no.)
x ≠ 6
Hence the value x = 6 is excluded from the domain of the expression.
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