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Verified Answer :

In mathematical expression, You can write it as:
x/13 ≥ 4

Multiply both sides by 13, 
x/13 13 ≥ 4 13
x ≥ 52

In short, Your Answer would be x ≥ 52

Hope this helps!

x   ≥  4   is x/13 times 13 ≥ 4 times 13
13

That means that x ≥ 52.