Vgln. eerste graad (reeks 3)

Reeks met haakjes

\(3(6x+5)=-11+(5+x)\)

\(\begin{align} & \color{red}{3} (6x+5)& = & -11 \color{red}{+} (5+x) \\\Leftrightarrow & 18x+15& = &-11+5+x \\\Leftrightarrow & 18x \color{red}{+15} & = &-6 \color{red}{+x} \\\Leftrightarrow & 18x \color{red}{+15} \color{blue}{-15} \color{blue}{-x} & = &-6 \color{red}{+x} \color{blue}{-x} \color{blue}{-15} \\\Leftrightarrow & 18x-x& = &-6-15 \\\Leftrightarrow & 17x& = &-21 \\\Leftrightarrow & \frac{17x}{ \color{red}{17} }& = &\frac{-21}{ \color{red}{17} } \\\Leftrightarrow & x = \frac{-21}{17} & & \\ & V = \left\{ \frac{-21}{17} \right\} & \\\end{align}\)