How to do this. Thank you.

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step-by-step explanation:

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)

i believe it’s 165 because if u add 137 and 58 u get 195 and then subtract that from 360 and there’s ur answer