Subtract the sum of `5x^2-6x+4` and `-4x^2-2x+3` from 0.

Subtract the sum of 5x - 4y + 6z and -8x + y - 2z from the sum of 12x - y + 3z and -3x + 5y - 8z

Subtract the sum of 2x-x^(2)+5 and -4x-3+7x^(2) om 5.

Subtract the sum of 7x^(2) - 4y^(2) " and " 4x^(2) + 3xy - 4y^(2) from the sum of 5x^(2) - 3xy - y^(2) "and " x^(2) + 2xy - 2y^(2) .

Subtract the sum of 13 x-4y+7z and -6z+6x+3y from the sum of 6x-4y-4z and 2x+4y-7.

Subtract the sum of - 3x^3y^2 + 2x^2 y^3 and - 3x^2y^3 - 5y^4 " from " x^4 + x^3y^2 + x^2y^3 + y^4

From the sum of 4+3x and 5-4x+2x^(2) subtract the sum of 3x^(2)-5x and -x^(2)+2x+5

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

From the sum of 4x^4-3x^3+6x^2,\ 4x^3+4x-3 and -3x^4-5x^2+2x subtract 5x^4-7x^3-3x+4.

From the sum of 3x^2-5x+2 and -5x^2-8x+9 subtract 4x^2-7x+9.