A pair of sneakers cost x dollars and is subject to a 6.5%. Using only one step, write an equation that could be used to find the final cost, in dollars, of the pair of sneakers

1.065x

Step-by-step explanation:

I'll assume that you meant, "subject to a 6.5% sales tax."

Multiplying x dollars by 1.065 will result in the final cost. 1.065 is the result of adding 1 and the decimal fraction 0.065, which in turn stems from 6.5%.