$$ \begin{aligned} 14700 &= x-\frac{3}{10}x&& \text{multiply ALL terms by } \color{blue}{ 10 }. \\[1 em]10\cdot14700 &= 10x-10 \cdot \frac{3}{10}x&& \text{cancel out the denominators} \\[1 em]147000 &= 10x-3x&& \text{simplify right side} \\[1 em]147000 &= 7x&& \text{ swap the left and right side of the equation } \\[1 em]7x &= 147000&& \text{ divide both sides by $ 7 $ } \\[1 em]x &= \frac{147000}{7}&& \\[1 em]x &= 21000&& \\[1 em] \end{aligned} $$

This page was created using