1)220+(x-120)-997=-736
220+(x-120)-997=-736
220 + x – 120 – 997 = – 736
x = – 736 + 997 + 120 – 220
x = 161
2)-(234-x)+86=203
-(234-x)+86=203
– 234 + x + 86 = 203
x = 203 – 86 + 234
x = 351
3)(439+y)-662=40
439 + y – 662 = 40
y = 40 + 662 – 439
y = 263
4)6,8-(3,7-x)=8,8
6.8-(3.7-x)=8.8
6.8 – 3.7 + x = 8.8
x = 8,8 + 3,7 – 6,8
x = 5.7
1)220+(x-120)-997=-736
220+(x-120)-997=-736
220 + x – 120 – 997 = – 736
x = – 736 + 997 + 120 – 220
x = 161
2)-(234-x)+86=203
-(234-x)+86=203
– 234 + x + 86 = 203
x = 203 – 86 + 234
x = 351
3)(439+y)-662=40
439 + y – 662 = 40
y = 40 + 662 – 439
y = 263
4)6,8-(3,7-x)=8,8
6.8-(3.7-x)=8.8
6.8 – 3.7 + x = 8.8
x = 8,8 + 3,7 – 6,8
x = 5.7