Bepaal de waarde x. Bij wiskundetaal en vraagstukken, gebruik x om op te lossen.
\(11x-8=9+x\)
\(\begin{align} & 11x \color{red}{-8}& = & 9 \color{red}{ +x } \\\Leftrightarrow & 11x \color{red}{-8}\color{blue}{+8-x }
& = & 9 \color{red}{ +x }\color{blue}{+8-x } \\\Leftrightarrow & 11x \color{blue}{-x }
& = & 9 \color{blue}{+8} \\\Leftrightarrow &10x
& = &17\\\Leftrightarrow & \color{red}{10}x
& = &17\\\Leftrightarrow & \frac{\color{red}{10}x}{ \color{blue}{ 10}}
& = & \frac{17}{10} \\\Leftrightarrow & \color{green}{ x = \frac{17}{10} } & & \\ & V = \left\{ \frac{17}{10} \right\} & \\\end{align}\)