5(14+б)=700
70+5б=700
5б=700-70
5б=630
б=630:5
б=126
1259-3у=602
-3у=602-1259
-3у= -657
у=-657:(-3)
у= 219
(21-z):21=0
21-z=0
-z=-21
z=21
1)5(14+Б)=700
2)1259-3у=602
3у=1259-602
3у=657
у=657:3
у=219
3)(21-z):21=0
1-z:21=0
z:21=1
5(14+б)=700
70+5б=700
5б=700-70
5б=630
б=630:5
б=126
1259-3у=602
-3у=602-1259
-3у= -657
у=-657:(-3)
у= 219
(21-z):21=0
21-z=0
-z=-21
z=21
1)5(14+Б)=700
70+5б=700
5б=700-70
5б=630
б=630:5
б=126
2)1259-3у=602
3у=1259-602
3у=657
у=657:3
у=219
3)(21-z):21=0
1-z:21=0
z:21=1
z=21