Thank you for the opportunity to help you with your question!
5x-100 and x-20 are supplementary so 6x-120=180, thus x=(120+180)/6=50°
Also 3y=x-20=50-20=30 finally y=30/3=10°
You can verifu that y+140 and x-20 are supplementary :
Hope it helps !!!
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