Question
$$9x+49 = 15x+13$$
Answer
$$ x = 6 $$
Explanation
$$ \begin{aligned} 9x+49 &= 15x+13&& \text{move the $ \color{blue}{ 15x } $ to the left side and $ \color{blue}{ 49 }$ to the right} \\[1 em]9x-15x &= 13-49&& \text{simplify left and right hand side} \\[1 em]-6x &= -36&& \text{ divide both sides by $ -6 $ } \\[1 em]x &= \frac{-36}{-6}&& \\[1 em]x &= 6&& \\[1 em] \end{aligned} $$
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