$$ \begin{aligned} 3x-3\cdot\frac{90}{1049} &= 10&& \text{multiply ALL terms by } \color{blue}{ 1049 }. \\[1 em]1049\cdot3x-1049\cdot3\cdot\frac{90}{1049} &= 1049\cdot10&& \text{cancel out the denominators} \\[1 em]3147x-270 &= 10490&& \text{ move -270 to the right } \\[1 em]3147x &= 10490+270&& \\[1 em]3147x &= 10760&& \text{ divide both sides by $ 3147 $ } \\[1 em]x &= \frac{10760}{3147}&& \\[1 em] \end{aligned} $$

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