$$-104 = 8x$$
Answer
$$ x = -13 $$
Explanation
$$ \begin{aligned} -104 &= 8x&& \text{ swap the left and right side of the equation } \\[1 em]8x &= -104&& \text{ divide both sides by $ 8 $ } \\[1 em]x &= -\frac{104}{8}&& \\[1 em]x &= -13&& \\[1 em] \end{aligned} $$
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