7(x-4) = 5x + 18
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How can you decide witch operations to use to slice a two step equation

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?

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?