Răspuns:
160-477÷[5-4÷(8-b÷1)]=1
477÷[5-4÷(8-b÷1)]=160-1
477÷[5-4÷(8-b÷1)]=159
5-4÷(8-b÷1)=477÷159
5-4÷(8-b÷1)=3
4÷(8-b÷1)=5-3
4÷(8-b÷1)=2
8-b÷1=4÷2
8-b÷1=2
b÷1=8-2
b÷1=6
b=1×6
b=6
