а)42172-5х=7152
5х=42172-7152
5х=35020
х=35020:5
х=7004
б) (y + 3 698) : 507 = 630
y+3698=630x507
y+3698=319410
y=319410-3698
y=315712
в) 26 176 : (y * 56 - 45 856) = 409
y 56-45856=26176:409
y 56 -45856=64
y56=64+45856
y 56=45920
y=45920 :56
y=820
а)42172-5х=7152
5х=42172-7152
5х=35020
х=35020:5
х=7004
б) (y + 3 698) : 507 = 630
y+3698=630x507
y+3698=319410
y=319410-3698
y=315712
в) 26 176 : (y * 56 - 45 856) = 409
y 56-45856=26176:409
y 56 -45856=64
y56=64+45856
y 56=45920
y=45920 :56
y=820