$$ \begin{aligned} \frac{2}{10}x+\frac{12}{100}(x+6000) &= 1280&& \text{multiply ALL terms by } \color{blue}{ 100 }. \\[1 em]100 \cdot \frac{2}{10}x+100\frac{12}{100}(x+6000) &= 100\cdot1280&& \text{cancel out the denominators} \\[1 em]20x+12x+72000 &= 128000&& \text{simplify left side} \\[1 em]32x+72000 &= 128000&& \text{ move 72000 to the right } \\[1 em]32x &= 128000-72000&& \\[1 em]32x &= 56000&& \text{ divide both sides by $ 32 $ } \\[1 em]x &= \frac{56000}{32}&& \\[1 em]x &= 1750&& \\[1 em] \end{aligned} $$

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