-4x + {(2x² -3) - (4- 3x²)} simplify
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= -4x+{(2x²-3)-(4-3x²)}
= -4x+{2x²-3-4+3x²}
= -4x+2x²-3-4+3x²
= 2x²+3x²-4x-3-4
= 5x²-4x-4
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