Combine like terms to simplify:

(5x + 2) + (4x - 5)

Add the polynomials.

(2x + 5y) + (3x - 2y)

Find the sum.

(5 + 3x) + (x - 12) =

Simplify:

(4x² + x) - (x² - 2x)

(6x² + x) + (7x² - x) =

(7x - x²) - (9x² + 2x) =

Subtract the polynomials:

(x³ - x² + 4) - (3x³ - 2x² + 3)

Simplify the expression.

(4n⁴ - 8n + 4) - (8n² + 4n⁴ + 1)

Find the difference.

(3 - 2x + 2x²) - (4x - 5 + 3x²)

What should be added to x $x^3$ to get  $-2x^3$ ?

What must be subtracted from 0 to get -5a?