$$ \begin{aligned} 75+\frac{25}{5}x\cdot5 &= 0&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5\cdot75+5 \cdot \frac{25}{5}x\cdot5 &= 5\cdot0&& \text{cancel out the denominators} \\[1 em]375+125x &= 0&& \text{ move the constants to the right } \\[1 em]125x &= -375&& \text{ divide both sides by $ 125 $ } \\[1 em]x &= -\frac{375}{125}&& \\[1 em]x &= -3&& \\[1 em] \end{aligned} $$

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