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= -3y²+2 atau 2-3y²
2. -3x - y + 2 + x + 7y - 5z = -2x + 6y - 5z + 7y
3. 2x² + X - 3 + ( -4x² + 2x + 1) = 2x² + x - 3 - 4x² + 2x + 1
= 3x - 2x² - 2
3y² + 6y² + 2y - 2y - 4 + 6
9y² + y + 2
-3x - y + 2 - x + 7y - 52
-3x - x - y + 7y + 2 - 52
-4x + 6y - 50
2x² + x - 3 - (-4x²) + 2x + 1
2x² + 4x² + x + 2x - 3 + 1
6x² + 3x - 2