Subtract `7x^3-3x^2+8x+16` from `9x^3+6x^2-6x+20`

Subtract: 6x^3-7x^2+5x-3 from 4-5x+6x^2-8x^3 x^3+2x^2y+6x y^2-y^3 from y^3-3x y^2-4x^2y

Subtract 11x^(3) -7x^(2) + 10x from 16x^(3) + 4x^(2) -11x

Subtract: x^2-3x y+7y^2-2 from 6x y-4x^2-y^2+5

Subtract 3x^(2) - 6x - 4 from 5 + x - 2x^(2)

Subtract: 7x^(4)-5x^(3)+4x^(2)+3x-3 from 6x^(4)-4x^(3)-8x^(2)-2x+7

Subtract (2x^(2) - 5x + 7) from (3x^(2) + 4x - 6)

Subtract: (i) 5a + 7b - 2c from 3a - 7b + 4c (ii) a - 2b - 3c from -2a + 5b - 4c (iii) 5x^(2) - 3xy + y^(2) from 7x^(2) - 2xy - 4y^(2) (iv) 6x^(3) - 7x^(2) + 5x - 3 from 4 - 5x + 6x^(2) - 8x^(3) (v) x^(3) + 2x^(2) y + 6xy^(2) - y^(3) from y^(3) - 3xy^(2) - 4x^(2) (vi) -11 x^(2) y^(2) + 7xy - 6 from 9x^(2) y^(2) - 6xy + 9 (vii) -2a + b + 6d from 5a - 2b - 3c

From the sum of 6x^(4) - 3x^(3) + 7x^(2) - 5x + 1 and -3x^(4) + 5x^(3) - 9x^(2) + 7x - 2 subtract 2x^(4) - 5x^(3) + 2x^(2) - 6x - 8

What should be subtracted from -7x^(3)+2x^(2)+8 to obtain -4x^(2)+9x-6