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= -2m+3
b. 9p2 - 4pq -q2-4p2+5pq-3q2 = 9p2-4p2 -4pq+5pq-q2-3q2
= 5p2 +pq-4q2
c. 12x3 - 9x2 -8 - 15x3 + 7x2 + 5 = 12x3 - 15x3 -9x2 + 7x2 -8+ 5
= -3x3 - 2x2 -3
b. 9p² - 4pq - q² - 4p² + 5pq - 3q² = 9p²-4p²-4pq+5pq-q²-3q²=5p²+pq-4q²
c. 12x³ - 9x² - 8 - 15x³ + 7x²+5 = 12x³ - 15x³ -9x² + 7x² - 8 + 5=-3x³-2x²-3