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3000 + (-30) - (-1400)
3000 -30 + 1400(berubah menjadi + karena -(-) )
3000+1100
4100
3000+1.500:(-50)-(-1.400)=
3000+(-30)-(1.400)=
2.970-(-1.400)=3570
caranya di ×dulu terus di : terus di+ terus - begitu caranya
semoga membatu