Move the negative sign to the left.
\[-\frac{6}{7\times 6\times 7}\times \frac{2}{5}-\frac{3}{4}\]
Simplify \(7\times 6\) to \(42\).
\[-\frac{6}{42\times 7}\times \frac{2}{5}-\frac{3}{4}\]
Simplify \(42\times 7\) to \(294\).
\[-\frac{6}{294}\times \frac{2}{5}-\frac{3}{4}\]
Simplify \(\frac{6}{294}\) to \(\frac{1}{49}\).
\[-\frac{1}{49}\times \frac{2}{5}-\frac{3}{4}\]
Use this rule: \(\frac{a}{b} \times \frac{c}{d}=\frac{ac}{bd}\).
\[-\frac{1\times 2}{49\times 5}-\frac{3}{4}\]
Simplify \(1\times 2\) to \(2\).
\[-\frac{2}{49\times 5}-\frac{3}{4}\]
Simplify \(49\times 5\) to \(245\).
\[-\frac{2}{245}-\frac{3}{4}\]
Simplify.
\[-\frac{743}{980}\]
Decimal Form: -0.758163
-743/980
