This phase I trial is studying the side effects and best dose of oxaliplatin when given together with leucovorin and fluorouracil in treating young patients with advanced solid tumors. Drugs used in chemotherapy, such as oxaliplatin, leucovorin, and fluorouracil, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Giving more than one drug (combination chemotherapy) may kill more tumor cells.