Question
$$30-4(x+5) = 0$$
Answer
$$ x = \dfrac{5}{2} $$
Explanation
$$ \begin{aligned} 30-4(x+5) &= 0&& \text{simplify left side} \\[1 em]30-(4x+20) &= 0&& \\[1 em]30-4x-20 &= 0&& \\[1 em]-4x+10 &= 0&& \text{ move the constants to the right } \\[1 em]-4x &= -10&& \text{ divide both sides by $ -4 $ } \\[1 em]x &= \frac{-10}{-4}&& \\[1 em]x &= \frac{5}{2}&& \\[1 em] \end{aligned} $$
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