Based on the definition of congruent angles, the value of x is: 23.
Congruent angles have the same measure. Examples of angles that are congruent are:
Thus:
(5x + 16) = (6x - 7) -- congruent angles
Combine like terms
5x - 6x = -16 - 7
-x = -23
x = 23
Therefore, based on the definition of congruent angles, the value of x is: 23.
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