What should come in place of the question mark (?) in the following questions?
Expression : $$7\frac{2}{7}of189 + 452 = 2000-?$$
=> $$\frac{51}{7} \times 189 + 452 = 2000 - ?$$
=> $$1377 + 452 = 2000 - ?$$
=> $$? = 2000 - 1829 = 171$$
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