$$2\cdot(1-x)+3 = -8$$
Answer
$$ x = \frac{13}{2} $$
Explanation
$$ \begin{aligned} 2\cdot(1-x)+3 &= -8&& \text{simplify left side} \\[1 em]2-2x+3 &= -8&& \\[1 em]-2x+5 &= -8&& \text{ move 5 to the right } \\[1 em]-2x &= -8-5&& \\[1 em]-2x &= -13&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= \frac{-13}{-2}&& \\[1 em]x &= \frac{13}{2}&& \\[1 em] \end{aligned} $$
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