I believe I figured it out after a moment of contemplation. Just a warning in case anyone else does not already know the answer, but this is what I believe it to be:


The two numbers when combined, or fused, together effectively create an image of the sum on the right side of the equation. The two sevens ultimately gave away the hint for me, and when I applied it to the other two, it created a similar image. The two sevens, when combined, create the triangle, the two threes create the eight, and the two twos create the fish. It was a rather unique riddle.