| 3-(4+2)= | 3-4-2=-3 |
| 15+(7-3)= | 15+7-3=19 |
| 39-(28-9)= | 39-28+9=20 |
| 25+(-4-7)= | 25-4-7=14 |
| 49-(-18+13)= | 49+18-13=54 |
| 78-(5-(2+7))= | 78-(5-2-7)=78-5+2+7=82 |
| (25-13)-(18+4)= | 25-13-18-4=-10 |
| 93-(10+(15-25))= | 93-(10+15-25)=93-10-15+25=93 |
| 100+(15-(90+15))= | 100+(15-90-15)=100+15-90-15=10 |
| 44-(28-(15-8))= | 44-(28-15+8)=44-28+15-8=23 |
| (51-9)+(15-38)= | 51-9+15-38=19 |
| 50-(40-(30-(20-10)))= | 50-(40-(30-20+10))=50-(40-30+20-10)=50-40+30-20+10=30 |
| 99-(88-77)= | 99-88+77=88 |
| (25-(34-53+5))= | (25-34+53-5)=25-34+53-5=39 |
| 40-(30+20-(10+20))= | 40-(30+20-10-20)=40-30-20+10+20=20 |