Vgln. eerste graad (reeks 2)

Bepaal de waarde van x. Meerdere manieren van oplossen mogelijk

\(9x+3=-3+7x\)

\(\begin{align} & 9x \color{red}{+3}& = & -3 \color{red}{ +7x } \\\Leftrightarrow & 9x \color{red}{+3}\color{blue}{-3-7x } & = & -3 \color{red}{ +7x }\color{blue}{-3-7x } \\\Leftrightarrow & 9x \color{blue}{-7x } & = & -3 \color{blue}{-3} \\\Leftrightarrow &2x & = &-6\\\Leftrightarrow & \color{red}{2}x & = &-6\\\Leftrightarrow & \frac{\color{red}{2}x}{ \color{blue}{ 2}} & = & \frac{-6}{2} \\\Leftrightarrow & \color{green}{ x = -3 } & & \\ & V = \left\{ -3 \right\} & \\\end{align}\)