In the diagram above, lines a and b are parallel. Find the value of x.

Answer:
x= 21
Step-by-step explanation:
Could i get brainliest please? :D
Answer:
x=21
Step-by-step explanation:
143=(6x+17)
143-17=6x+17-17
126=6x
126/6=6x/6
21=x
Hope this helps :)