Question
$$2l+6 = 6l-10$$
Answer
$$ l = 4 $$
Explanation
$$ \begin{aligned} 2l+6 &= 6l-10&& \text{move the $ \color{blue}{ 6l } $ to the left side and $ \color{blue}{ 6 }$ to the right} \\[1 em]2l-6l &= -10-6&& \text{simplify left and right hand side} \\[1 em]-4l &= -16&& \text{ divide both sides by $ -4 $ } \\[1 em]l &= \frac{-16}{-4}&& \\[1 em]l &= 4&& \\[1 em] \end{aligned} $$
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