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2x(25 +40x +16x²) - 4x ( -18x -30x² +21 +35x)- (8x³ -3·4x² ·1 +3·2x·1² - 1³)=
50x +80x² +32x³ +72x² + 120x³ - 84x -140x² - 8x³ +12x² - 6x +1=
=144x³ +24x² -40x +1