\( \dfrac{\dfrac{29-0}{46+\left(-44\right)}*\dfrac{20+\left(-12\right)}{7-9}}{\dfrac{\dfrac{21}{3}}{\dfrac{6}{\left(-3\right)}}+\dfrac{\dfrac{\left(-25\right)}{5}}{\dfrac{\left(-6\right)}{3}}} \)