$$ \begin{aligned} \frac{30}{3}x\cdot3+5 &= 0&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3 \cdot \frac{30}{3}x\cdot3+3\cdot5 &= 3\cdot0&& \text{cancel out the denominators} \\[1 em]90x+15 &= 0&& \text{ move the constants to the right } \\[1 em]90x &= -15&& \text{ divide both sides by $ 90 $ } \\[1 em]x &= -\frac{15}{90}&& \\[1 em]x &= -\frac{1}{6}&& \\[1 em] \end{aligned} $$

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