Solve: $\frac{7}{10} - x = \frac{3}{5}$

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Solution

$\frac{7}{10} - x = \frac{3}{5}$

$\Rightarrow x = \frac{7}{10} - \frac{3}{5}$

$\Rightarrow x = \frac{7}{10} - \frac{3 \times 2}{5 \times 2}$

$\Rightarrow x = \frac{7}{10} - \frac{6}{10}$

$\Rightarrow x = \frac{7 - 6}{10} = \frac{1}{10}$

$∴ x = \frac{1}{10}$

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(3^{- 7} \div 3^{- 10}) \times 3^{- 5}

Simplify:
$(3^{- 7} \times 3^{- 10}) \times 3^{- 5}$ .

\frac{2 - 7 x}{1 - 5 x} = \frac{3 + 7 x}{4 + 5 x}

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