Vgln. eerste graad (reeks 1)

Bepaal de waarde van x.

\(12x-7=-13\)

\(\begin{align} & 12x \color{red}{-7}& = &-13 \\\Leftrightarrow & 12x \color{red}{-7}\color{blue}{+7} & = &-13\color{blue}{+7} \\\Leftrightarrow &12x & = &-6\\\Leftrightarrow & \color{red}{12}x & = &-6\\\Leftrightarrow & \frac{\color{red}{12}x}{ \color{blue}12} & = & \frac{-6}{12} \\\Leftrightarrow & \color{green}{ x = \frac{-1}{2} } & & \\ & V = \left\{ \frac{-1}{2} \right\} & \\\end{align}\)