Answer :

You will use the sine law.
180-90-73=17
x/sin(73)=17/sin(17)
Then you will rearrange, to solve for x
x=(17*sin(73))/sin(17)=55.6 to 3 sig.fig. 

Have a nice day :D
D0 190-90-73-17
Subtract it for your answer

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