Vgln. eerste graad (reeks 1)

Bepaal de waarde van x.

\(3x-12=-4\)

\(\begin{align} & 3x \color{red}{-12}& = &-4 \\\Leftrightarrow & 3x \color{red}{-12}\color{blue}{+12} & = &-4\color{blue}{+12} \\\Leftrightarrow &3x & = &8\\\Leftrightarrow & \color{red}{3}x & = &8\\\Leftrightarrow & \frac{\color{red}{3}x}{ \color{blue}3} & = & \frac{8}{3} \\\Leftrightarrow & \color{green}{ x = \frac{8}{3} } & & \\ & V = \left\{ \frac{8}{3} \right\} & \\\end{align}\)