3x^2 - 5x + 15
12x^2 - 3x + 6
-x^3 - 3x^2 + 4x + 6
(3 + 4x - 2x^2) + (x - 6 - x^2)
(4x - 3) + (2x)
-x^4 + x^2 - 3x + 3
(x^2 - 2) - (x^3 - x^4 + 4)
(4x^2 + 9x - 11) - (8x^2 + 2x + 3)
(8x^2 - 4x + 12) - (5x^2 + x - 3)
x^4 - x^3 + x^2 - 6
x^4 + 11x^2 - 2x - 4
(7x - x^4 + 9) - (10x + 6 - x^2)
-3x^3 + 6x^2 + x - 5
(x^4 + 3x^2 - 1) - (2x + 3 - 8x^2)
(12x^2 - 9x + 1) + (6x + 5)
-4x^2 + 7x - 14
(2x^2 - 3 + 4x) + (9 - 5x^2 - x^3)
(x^2 + x - 3) + (5x^2 - 2 - 3x^3)
-3x^2 + 5x - 3
6x - 3
