Basic JavaScript - Assigning the Value of One Variable to Another

Would you please explain to me where I did wrong and why ?I’m new and first time in coding ! Thank you,

// 
var b;
b=7;
var a;
a=b;
// Only change code below this line

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Challenge: Basic JavaScript - Assigning the Value of One Variable to Another

Link to the challenge:

When you see // Only change code below this line, that means, do not change any of the code above that line. Also, the instructions state assign the contents of a to variable b and not assign the contents of b to variable a.

I suggest clicking the Reset All Code button and try again.

Hi!
Ok, I will try and I hope I’ll fix it !
Thank you so much for your message,