1.(59xa+2023):50+2=2760
(59xa+2023):50=2760-2
(59xa+2023):50=2758
59xa+2023=137900
59xa=137900-2023
59xa=135877
a=2303
2. (b:5x501-1):1000=251
(b:5x501-1)=251000
b:5x501=251000+1
b:5x501=251001
b:5=501
b=2505
3. 4160:65+c-1938=670
64+c=670+1938
c=2608-64
c=2544
4. (1040:8+10870):11+2000-b=465
(130+10870):11+2000=465+b
(11000):11+2000=465+b
1000+2000=465+b
3000-465=b
b=2535