Vgln. eerste graad (reeks 3)

Reeks met haakjes

\(2(-x+1)=1-(14+x)\)

\(\begin{align} & \color{red}{2} (-x+1)& = & 1 \color{red}{-} (14+x) \\\Leftrightarrow & -2x+2& = &1-14-x \\\Leftrightarrow & -2x \color{red}{+2} & = &-13 \color{red}{-x} \\\Leftrightarrow & -2x \color{red}{+2} \color{blue}{-2} \color{blue}{+x} & = &-13 \color{red}{-x} \color{blue}{+x} \color{blue}{-2} \\\Leftrightarrow & -2x+x& = &-13-2 \\\Leftrightarrow & -x& = &-15 \\\Leftrightarrow & \frac{-x}{ \color{red}{-1} }& = &\frac{-15}{ \color{red}{-1} } \\\Leftrightarrow & x = 15 & & \\ & V = \left\{ 15 \right\} & \\\end{align}\)