Question
$$3x+15 = 4-x$$
Answer
$$ x = -\dfrac{11}{4} $$
Explanation
$$ \begin{aligned} 3x+15 &= 4-x&& \text{move the $ \color{blue}{ -x } $ to the left side and $ \color{blue}{ 15 }$ to the right} \\[1 em]3x+x &= 4-15&& \text{simplify left and right hand side} \\[1 em]4x &= -11&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= -\frac{11}{4}&& \\[1 em] \end{aligned} $$
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