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UKMT Senior Mathematical Challenge, 2019

Algebra Difficulty 1.0 Junior Find the answer United Kingdom

What is the value of $(2019 - (2000 - (10 - 9))) - (2000 - (10 - (9 - 2019)))$ ?

(A) $4040$ (B) $40$ (C) $-400$ (D) $-4002$ (E) $-4020$

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