tolong di jawab pke cara kerja

a. 10/3x + 8/3x = 18/3x = 6/x atau 6 1/x

b. 4a/3x - 4/2x = 2(4a)/6x - 3(4)/6x = 8a/6x - 12/6x = (8a-12)/6x

c. 2a/3x . (2x - 6)/12a = (2x-6)/18x = 2(x-3)/18x = (x-3)/9x

d. xy/z : x/yz = xy/z . yz/x = y²