Respuesta :

faithscott8989oxmgmr
15=-4+z/3

+4 +15 = +4 -4 +z/3
cancels the 4 on the right side

19 = z/3

3 x 19 = z/3 x 3
cancels 3 on the right side

I think the answer is z = 57
boyitsnick
Z = 57
Hope this helps!