The value of the missing length is 20
Let the missing length be x
From Parallel lines and transversal theorem, we have that
If three or more parallel lines intersect two transversals, then they cut off the transversals proportionally.
Then, we can write that

∴ 
x = 20
Hence, the value of the missing length is 20
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Answer: i will put the answer as a comment but what are you rounding to
Step-by-step explanation:
Answer:
X=14
Step-by-step explanation:
Answer:
x = 12
Step-by-step explanation: