Answer:
Step-by-step explanation:
Since RQTS is a parallelogram
[tex]\angle Q +\angle T=180^{o}[/tex]
[tex]3x+5+9x-17=180^o[/tex]
[tex]12x-12=180^o[/tex]
[tex]12x-12+12=180+12[/tex]
[tex]12x=192[/tex]
[tex]\cfrac{12x}{12}=\cfrac{192}{12}[/tex]
[tex]x=16[/tex]
Hope it helps!
