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2. 10+(-4)-(-9) = 10-4+9= 15
3. -12+19-(-15) = -12+19+15= 22
4. 12-[15-(18)] = 12-[-3] = 12+3= 15
5. -30-[45-(-27)]= -30-[45+27] = -30-[72]= -102
2. 10 + (-4) - (-9) = 10 - 4 + 9 = 15
3. -12 + 19 - (-15) = -12 + 19 + 15 = 22
4. 12 - [15-(18)] = 12 - (-3) = 12 + 3 = 15
5. -30 - [45-(-27)] = -30 - [45+27] = -30 - 72 = -102