Question
$$4x-15 = x+15$$
Answer
$$ x = 10 $$
Explanation
$$ \begin{aligned} 4x-15 &= x+15&& \text{move the $ \color{blue}{ x } $ to the left side and $ \color{blue}{ -15 }$ to the right} \\[1 em]4x-x &= 15+15&& \text{simplify left and right hand side} \\[1 em]3x &= 30&& \text{ divide both sides by $ 3 $ } \\[1 em]x &= \frac{30}{3}&& \\[1 em]x &= 10&& \\[1 em] \end{aligned} $$
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