`500 – {5 [409 – (2^3 . 3 – 21)^2] – 1724}`
`= 500 – {5 [409 – (16 . 3 – 21)^2] – 1724}`
`= 500 – {5 [409 – (48 – 21)^2] – 1724}`
`= 500 – {5 [409 – 27^2] – 1724}`
`= 500 – {5 [409 – 729] – 1724}`
`= 500 – {5 . (-320) – 1724}`
`= 500 – {5 . (-320) – 1724}`
`= 500 – {-1600 – 1724}`
`= 500 – {-1600 – 1724}`
`= 500 - (-3324)`
`= 3824`
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