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Solve the following.
$$2550 - [510 - \left\{270 - (90 - 80 + 70)\right\}]$$
The correct option is A.
2550-[510-{270-(90-80+70)}]
= 2550-[510-{270-80}]
=2550-[510-190]
=2550-320=2230
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