$$ \begin{aligned} -102 \cdot \frac{x}{3}-126 &= 0&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]-3\cdot102 \cdot \frac{x}{3}-3\cdot126 &= 3\cdot0&& \text{cancel out the denominators} \\[1 em]-102x-378 &= 0&& \text{ move the constants to the right } \\[1 em]-102x &= 378&& \text{ divide both sides by $ -102 $ } \\[1 em]x &= -\frac{378}{102}&& \\[1 em]x &= -\frac{63}{17}&& \\[1 em] \end{aligned} $$

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