If 3 triangles is equal to 5 disks, and if 1 triangle is equal to 2 squares plus 1 disk, how many squares would it take to balance one disk?

If 3 triangles is equal to 5 disks, and if 1 triangle is equal to 2 squares plus 1 disk, how many squares would it take to balance one disk?

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Answer urgent

I found this question in a math olympiad question.BUT STILL DON'T KNOW HOW TO SOLVE