s=15 d=0,02 E=6 C-?

To find the value of \( C \), we can use the following formula that relates \( s \), \( d \), \( E \), and \( C \). However, your equation is not fully clear about which specific relationship you want to establish.

If \( C \) represents a specific value in a system defined by the other parameters, please clarify the relationship or the formula you're using.

If you're looking for a specific formula, please provide more context or details about how these variables relate to each other.