[tex]\dfrac{8(4-z)}{7}=-z\\\\8(4-z)=-7z\\\\32-8z=-7z\\\\-7z+8z=32\\\\z=32[/tex]
8(4 - z)/ 7 = -z
8(4 - z) = -7z
32 - 8z = -7z
-8z + 7z = -32
-z = -32
z = 32
