$$8x+2(x+10) = -80$$
Answer
$$ x = -10 $$
Explanation
$$ \begin{aligned} 8x+2(x+10) &= -80&& \text{simplify left side} \\[1 em]8x+2x+20 &= -80&& \\[1 em]10x+20 &= -80&& \text{ move 20 to the right } \\[1 em]10x &= -80-20&& \\[1 em]10x &= -100&& \text{ divide both sides by $ 10 $ } \\[1 em]x &= -\frac{100}{10}&& \\[1 em]x &= -10&& \\[1 em] \end{aligned} $$
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