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= -6400 + 30 + 1400
= -6370 + 1400
= -4970
2. 3000 + 1500 : (-50) - 200 x (-7)
= 3000 - 30 + 1400
= 2970 + 1400
= 4370
3. 800 - 900 + 650 x (-8) : 130
= 800 - 900 - 5200 : 130
= 800 - 900 - 40
= -100 - 40
= -140