Respuesta :

Hey there! :D

So, adjacent angles equal 180 degrees and are supplementary. 

10x-20+6x+8= 180

Combine like terms. 

16x-12= 180

Add 12 to both sides. 

16x= 192

Divide both sides by 16. 

x= 12

I hope this helps!
~kaikers 
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