This is a fun puzzle from John Bassey at Puzzle Sphere.
“The diagram shows a heptagon with three circles on each side. Some circles already have the numbers 8 to 14 filled in, while the remaining circles need to be filled with the numbers 1 to 7. Each circle must contain one number, and the sum of the numbers in every set of three circles along a line must be the same. Arrange the numbers!!!”
See Fill in the Blanks for a solution.