`c) -5/6 - x = 1/(1 . 2) + 1/(2 . 3) + 1/(3 . 4) + 1/(4 . 5)`

`-5/6 - x = 4/5`

`x = 4/5 + 5/6`

`x = 49/30`

`f) x - 5/3 = 1/3`

`x = 1/3 + 5/3`

`x = 2`

$\textit{e}$$\text{) $\dfrac{-5}{6}$ - $\textit{x}$ = $\dfrac{1}{1 . 2}$ + $\dfrac{1 }{2 . 3}$ + $\dfrac{1}{3 . 4}$ + $\dfrac{1}{4 . 5}$}$

$\text{$\dfrac{-5}{6}$ - $\textit{x}$ = 1 - $\dfrac{1}{2}$ + $\dfrac{1}{2}$ - $\dfrac{1}{3}$ + $\dfrac{1}{3}$ - $\dfrac{1}{4}$ + $\dfrac{1}{4}$ - $\dfrac{1}{5}$}$

$\text{$\dfrac{-5}{6}$ - $\textit{x}$ = 1 - $\dfrac{1}{5}$}$

$\text{$\dfrac{-5}{6}$ - $\textit{x}$ = $\dfrac{4}{5}$}$

$\textit{x}$ $\text{= $\dfrac{-5}{6}$ - $\dfrac{4}{5}$}$

$\textit{x}$ $\text{= $\dfrac{-1}{30}$ }$

$\textit{f}$$\text{) $\textit{x}$ - $\dfrac{5}{3}$ = $\dfrac{1}{3}$}$

$\text{$\textit{x}$ = $\dfrac{1}{3}$ + $\dfrac{5}{3}$}$

$\text{$\textit{x}$ = 2}$