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That could mean two different equations, so I'll solve both.
1. (√5x)

+ 7 = 13

(√5x)

= 6

5x = 36

x = 36/5

= 7 1/5


2.√(

5x+7) = 13

5x + 7 = 169

5x = 162

x = 162/5

= 31 2/5

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