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2.11-(-20)+(-10)=11+20-10=31-10=21
3.12-15-(-18)=12-15+18=-3+18=15
4.23-(-13)-28=23+13-28=46-28=18
5.-30+95-(-22)=-30+95+22=65+22=87
6.-25-40-(-17)=-65+17=-48
2. 11-(-20)+(-10) = 11+20-10 = 21
3. 12-15-(-18) = 12-15+18 = 15
4. 23-(-13)-28 = 23+13-28 = 18
5. -30+95-(-22) = -30+95+22 = 87
6. -25-40-(-17) = -25-40+17 = 48
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