Respuesta :
first, you must add 5 to both sides
7 + 5 = 12
11z = 9z + 12
then, subtract 9z from both sides
11z - 9z = 3z
3z = 12
divide both sides by 3
z = 4 :)
7 + 5 = 12
11z = 9z + 12
then, subtract 9z from both sides
11z - 9z = 3z
3z = 12
divide both sides by 3
z = 4 :)