which expressions are equivalent to x/3x + 8x/3x? Select all that apply. please helppp before 11:59 pm

a. 9x/3x

b. 9x/6x

c. 3, for x not equal to 0

d. 3/2, for x not equal to 0

e. 8x^2/3x

f. 8x/3, for x not equal to 0​