[tex]\bf 4.\\ \\ \it a)\ \ x-\dfrac{1}{5}=-\dfrac{4}{5}\Big|_{\cdot5} \Rightarrow 5x-1=-4|_{+1} \Rightarrow 5x=-3 \Rightarrow x=-\dfrac{3}{5}=-0,6\\ \\ \\ b)\ 2x-12=-7|_{+12} \Rightarrow 2x=5 \Rightarrow x=\dfrac{5}{2}=2,5[/tex]
[tex]\bf5.\\ \\ \it Not\breve am\ num\breve arul\ paginilor\ cu\ p\\ \\ 1-\dfrac{5}{8}=\dfrac{3}{8}\ din\ p\ au\ r\breve amas\ de\ citit\\ \\ \dfrac{3}{8}\ din\ p\ = 102 \Rightarrow \dfrac{3}{8}\cdot p=102 \Rightarrow p=102\cdot\dfrac{8}{3}=36\cdot8=288[/tex]
