Vgln. eerste graad (reeks 1)

Bepaal de waarde van x.

\(-15x-11=4\)

\(\begin{align} & -15x \color{red}{-11}& = &4 \\\Leftrightarrow & -15x \color{red}{-11}\color{blue}{+11} & = &4\color{blue}{+11} \\\Leftrightarrow &-15x & = &15\\\Leftrightarrow & \color{red}{-15}x & = &15\\\Leftrightarrow & \frac{\color{red}{-15}x}{ \color{blue}-15} & = & \frac{15}{-15} \\\Leftrightarrow & \color{green}{ x = -1 } & & \\ & V = \left\{ -1 \right\} & \\\end{align}\)