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b. 9p²-4pq-q²-4p²+5pq-3q² = 5p²+pq-4q²
c. 2(-8a-3b)-4a+9b = -16a-6b-4a+9b = -20a+3b
d. 12x³-9x²-8-15x³+7x²+5 = -3x³-2x²-3