If 2/3 x?=1 then what is the number for the question mark?

This is different from the first one can someone me

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9