Exterior angle what am I doing wrong?

Find the measure of the indicated exterior angle.

Exterior angle is: 197-5n
Two interior angles are: 5n+21 and n+11

I set it up as:
197-5n=5n+21+n+11
197-5n=6n+32
165=11n

but this does not make sense.

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  1. 165 = 11 n makes sense if n = 15

    Where are your angles being measured? Why should the sum of two interior angles equal an exterior angle?

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  2. how do you set the problem up wrong

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  3. X=8skay

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