$$ \begin{aligned} q+\frac{16}{16} &= 0&& \text{multiply ALL terms by } \color{blue}{ 16 }. \\[1 em]16q+16\cdot\frac{16}{16} &= 16\cdot0&& \text{cancel out the denominators} \\[1 em]16q+16 &= 0&& \text{ move the constants to the right } \\[1 em]16q &= -16&& \text{ divide both sides by $ 16 $ } \\[1 em]q &= -\frac{16}{16}&& \\[1 em]q &= -1&& \\[1 em] \end{aligned} $$

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