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Simplify :

4x3 – [9x2 – { -5x3 – (2 – 7x2) + 6x}]

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4x3 – [9x2 – { -5x3 – (7 + 7x2) + 6x}}

= 4x2 – [9x2 – { -5 -2 + 7×2 + 6x}]
= 4x3 – [9x2 + 5x3 + 2 – 7x2 – 6x]
= 4x3 – 9x2 – 5x3 – 2 + 7x2 + 6x
= 4x3 – 5x3 – 9x2 + 7x2 + 6x – 2
= -x3 – 2x2 + 6x – 2

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