12x - [3x3 + 5x2 - { 7x2 - (4 - 3x - x3 ) + 6x3 } - 3x]
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Equating the equation to 0,
12x - [3x3 + 5x2 - { 7x2 - (4 - 3x - x3 ) + 6x3 } - 3x] = 0
12x - [3x^3 + 5x^2 - { 7x^2 - 4 + 3x + x^3 + 6x^3 } - 3x] = 0
12x - [3x^3 + 5x^2 - 7x^2 + 8 - 3x - x^3 - 6x^3 - 3x] = 0
12x - 3x^3 - 5x^2 + 7x^2 - 8 + 3x + x^3 + 6x^3 + 3x = 0
-3x^3 + 6x^3 + x^3 - 5x^2 + 7x^2 + 12x + 3x + 3x - 8 = 0
4x^3 + 2x^2 + 18x - 8 = 0
Reducing the equation by 2,
2x^3 + x^2 + 19x - 4 = 0
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