[tex]-3=z+4\qquad|-4\\-7=z\to\boxed{z=-7}\\\\-----------------------------\\\\z-4=-8\qquad|+4\\\boxed{z=-4}\\\\-----------------------------\\\\2y=2.8\qquad|:2\\\boxed{y=1.4}\\\\-----------------------------\\\\\dfrac{z}{3}=-7\qquad|\cdot3\\\boxed{z=-21}\\\\-----------------------------\\\\\dfrac{2}{5}x=-4\qquad|\cdot5\\2x=-20\qquad|:2\\\boxed{x=-10}[/tex]
[tex]-----------------------------\\\\2(h-8)-h=h-16\qquad|\text{use distributive property}\\(2)(h)+(2)(-8)-h=h-16\\2h-16-h=h-16\qquad|+16\\2h-h=h\\h=h\qquad|-h\\0=0\qquad TRUE\\\boxed{infinitely\ many\ solutions}\\\\-----------------------------\\\\4+2y=9+2y\qquad|-2y\\4=9\qquad FALSE\\\boxed{no\ solution}[/tex]
