Vgln. eerste graad (reeks 3)

Reeks met haakjes

\(5(-4x+2)=-1+(-3+x)\)

\(\begin{align} & \color{red}{5} (-4x+2)& = & -1 \color{red}{+} (-3+x) \\\Leftrightarrow & -20x+10& = &-1-3+x \\\Leftrightarrow & -20x \color{red}{+10} & = &-4 \color{red}{+x} \\\Leftrightarrow & -20x \color{red}{+10} \color{blue}{-10} \color{blue}{-x} & = &-4 \color{red}{+x} \color{blue}{-x} \color{blue}{-10} \\\Leftrightarrow & -20x-x& = &-4-10 \\\Leftrightarrow & -21x& = &-14 \\\Leftrightarrow & \frac{-21x}{ \color{red}{-21} }& = &\frac{-14}{ \color{red}{-21} } \\\Leftrightarrow & x = \frac{2}{3} & & \\ & V = \left\{ \frac{2}{3} \right\} & \\\end{align}\)