18x-[5x³+3x³-{2x²-(6-2x-x³)-5x³}-5x³}-3x]
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18x-[5x³+3x³-{2x²-(6-2x-x³)-5x³-5x³}-3x]
18x-[5x³+3x³-{2x²-6+2x+x³-10x³}-3x]
18x-[5x³+3x³-2x²+6-2x+9x³-3x]
18x - [17x³-2x²+6-5x]
18x - 17x³ + 2x² - 6 + 5x
-17x³ + 2x² - 6 + 23x
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