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3X + 4X+5y2+(-2y2)- 7
= -X+3y2 - 7
3x - 3y² + 6 - 10x - 15y² + 10
3x - 10x - 3y² - 15y² + 6 + 10
-7x - 18y² + 16
2. -2(p³ - 2pq + q²) + 3(p³ + 4pq - q²)
-2p³ + 4pq - 2q² + 3p³ + 12pq - 3q²
-2p³ + 3p³ + 4pq + 12pq - 2q² - 3q²
p³ + 16pq - 5q²
semoga bermanfaat