1) 321+(х+13)=450
321 + x + 13 = 450
x = 450 – 13 – 321
x = 116
2) (63-у)+109=121
63 – y + 109 = 121
– y = 121 – 109 – 63
-y = -51
y = 51
3) 204-(х+29)=100
204 – x – 29 = 100
– x = 100 + 29 – 204
-x = -75
x = 75
4) 53-(у-13)=24
53 – y + 13 = 24
– y = 24 – 13 – 53
-y = -42
y = 42
1) 321+(х+13)=450
321 + x + 13 = 450
x = 450 – 13 – 321
x = 116
2) (63-у)+109=121
63 – y + 109 = 121
– y = 121 – 109 – 63
-y = -51
y = 51
3) 204-(х+29)=100
204 – x – 29 = 100
– x = 100 + 29 – 204
-x = -75
x = 75
4) 53-(у-13)=24
53 – y + 13 = 24
– y = 24 – 13 – 53
-y = -42
y = 42