sederhanakan dari bentuk aljabar berikut. tolongg bantuannya

4. 2a/3x . 2x - 6xy/12a = 2a/3x . 2x(1 - 3y)/ 12a (coret variabel yang sama)
                                      = 2/3 .2(1-3y)/12
                                      = 4(1-3y)/ 36
                                      = (1 - 3y) / 9
5. 12/(x-3)(x+3) : 3/(x+3) = 12/(x+3)(x-3) × (x+3)/3 (coret  x + 3)
                                          = 12/(x-3) × 1/3
                                          =  4/(x-3)