Respuesta:
[tex]2 \times (45 - 3 \times (7 \times 7 - 6 \times 6)) \div 3 \\ 2 \times (45 - 3 \times (49 - 36)) \div 5 \\ 2 \times (45 - 3 \times 13) \div 3 \\ 2(45 - 39) \div 3 \\ 2 \times6 \div 3 \\ 4[/tex]
