A jar contains a blend of a fruit juice and water in the ratio $5 : x$. When $1$ liter of water is added to $4$ liters of the blend, the ratio of fruit juice to water becomes $1 : 1$. What is the value of $x$?
Options:
- A: $3$
- B: $2$
- C: $4$
- D: $1$
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