Vgln. eerste graad (reeks 1)

Bepaal de waarde van x.

\(2x-5=5\)

\(\begin{align} & 2x \color{red}{-5}& = &5 \\\Leftrightarrow & 2x \color{red}{-5}\color{blue}{+5} & = &5\color{blue}{+5} \\\Leftrightarrow &2x & = &10\\\Leftrightarrow & \color{red}{2}x & = &10\\\Leftrightarrow & \frac{\color{red}{2}x}{ \color{blue}2} & = & \frac{10}{2} \\\Leftrightarrow & \color{green}{ x = 5 } & & \\ & V = \left\{ 5 \right\} & \\\end{align}\)