Logical thinking with symbols [lvl1+ Ends 21.03. 18:00CET]

So im currently on the hunt for a new job and i already had to do some really nerve-wrecking tests twice.
In these tests i came across a type of logical thinking tasks which i actually enjoyed somehow.

So, i thought, why not make some GAs with that? :D
And since it will be a little Brain-Teaser, i will give away two Turn-based Strategygames for the brains out there!. (one 80% positive, one 66% positive on Steam, got both in a bundle)

So here is an ItsTooHard!
And since i'm a nice guy, i'll give you an example:

Below you see a question/equation entirely made of Symbols and you have to determine which symbol represents which number.
To make things easier for you, i decided to give you just problems where only the numbers [0,1,2,3,4,5] where used.
So lets see how this works out:

• 0: cant be. 0+0+0 = still 0. But the result must be 2-digit number!
• 1: Same applies here: 1+1+1=3. 1-digit :(
• 2: Still a 1-digit result
• 3: close. but still a 1-digit result.
• 4: 4+4+4 = 12. Nice! a 2-digit number. But when the circel represents a 4, the result should end with a 4. Does 12 end with 4? nope!
• 5: 5+5+5=15. Here we go! That fits! Circel=5. It must be!
  

View attached image.