Respuesta :

8)
if 3x/4 = 12 then 3x = 4(12) = 48

9)
7x - 4 = 3x + 8
4x - 4 = 8 
subtraction property of equality

number 8. 3x=16
9. is x=3 but i dont know what property it is i was using my trusty cymath online tool to help