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= 3x²+4+8-21/6= 3x²+12-21/6=3x²+72/6-21/6=3x²+51/6=3x²+8 ½
2) 15p²-9p/6 -6 × 1-6p/4=15p²-3p/2 -6 × 1-3p/2=15p²-3p-6