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= 7
2. 11+(-6)+(-18)= 5+(-18)
= -13
3. -21+7+(-8) = -14+(-8)
= -22
4. -15+12+(-10)= -3+(-10)
= -13
5. -11+(-8)-(-18)= -19+18
= -1
∵→TERIMAKASIH←∴