Vgln. eerste graad (reeks 3)

Reeks met haakjes

\(2(2x-4)=12-(13-3x)\)

\(\begin{align} & \color{red}{2} (2x-4)& = & 12 \color{red}{-} (13-3x) \\\Leftrightarrow & 4x-8& = &12-13+3x \\\Leftrightarrow & 4x \color{red}{-8} & = &-1 \color{red}{+3x} \\\Leftrightarrow & 4x \color{red}{-8} \color{blue}{+8} \color{blue}{-3x} & = &-1 \color{red}{+3x} \color{blue}{-3x} \color{blue}{+8} \\\Leftrightarrow & 4x-3x& = &-1+8 \\\Leftrightarrow & x& = &7 \\ & V = \left\{ 7 \right\} & \\\end{align}\)