9 + 3x - 9x + 16 Like terms are terms that have the same variable and powers.
9 and 16 are like terms. They don't have any other variables and can easily be solved.
9 + 16 = 25
3x and -9x are like term. They both have the same variable and powers, x. The coefficients, 3 an d-9, don't have to match as long as the variable and powers are the same.
