$$-3 = 15+4x$$
Answer
$$ x = -\frac{9}{2} $$
Explanation
$$ \begin{aligned} -3 &= 15+4x&& \text{ swap the left and right side of the equation } \\[1 em]15+4x &= -3&& \text{ move 15 to the right } \\[1 em]4x &= -3-15&& \\[1 em]4x &= -18&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= -\frac{18}{4}&& \\[1 em]x &= -\frac{9}{2}&& \\[1 em] \end{aligned} $$
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