Question
$$3x-1 = 15-x$$
Answer
$$ x = 4 $$
Explanation
$$ \begin{aligned} 3x-1 &= 15-x&& \text{move the $ \color{blue}{ -x } $ to the left side and $ \color{blue}{ -1 }$ to the right} \\[1 em]3x+x &= 15+1&& \text{simplify left and right hand side} \\[1 em]4x &= 16&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= \frac{16}{4}&& \\[1 em]x &= 4&& \\[1 em] \end{aligned} $$
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