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Find the most difficult problem in junior high school mathematics! !
It involves all knowledge. Not very realistic. After all, it is difficult to relate geometry to algebra. I have a geometry topic here. I thought of it myself. I proved it myself. I find it a little difficult.

The parallel line EF△ABC with BC in the middle of any triangle intersects AB at E, AC at F, FB at O, and AO at G, verifying BG=CG.