$$4-2(x+1) = 18$$
Answer
$$ x = -8 $$
Explanation
$$ \begin{aligned} 4-2(x+1) &= 18&& \text{simplify left side} \\[1 em]4-(2x+2) &= 18&& \\[1 em]4-2x-2 &= 18&& \\[1 em]-2x+2 &= 18&& \text{ move 2 to the right } \\[1 em]-2x &= 18-2&& \\[1 em]-2x &= 16&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= -\frac{16}{2}&& \\[1 em]x &= -8&& \\[1 em] \end{aligned} $$
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