Question
$$25-2(x+3) = 21$$
Answer
$$ x = -1 $$
Explanation
$$ \begin{aligned} 25-2(x+3) &= 21&& \text{simplify left side} \\[1 em]25-(2x+6) &= 21&& \\[1 em]25-2x-6 &= 21&& \\[1 em]-2x+19 &= 21&& \text{ move 19 to the right } \\[1 em]-2x &= 21-19&& \\[1 em]-2x &= 2&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= -\frac{2}{2}&& \\[1 em]x &= -1&& \\[1 em] \end{aligned} $$
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