Answer:
7x-5
Explanation:
I think the missing length is 7x -5
answer: if the x=2
16.2=32 32-6=26
4.2=8 8+1=9 26-9=17
5.2=10 10-2=8 17-8=9
7.2=14 14-5=9 9-9=0
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