ಸಮೀಕರಣ \(\frac{{21\, + \,\left( { - 18} \right)\,\, \times \,2 - \,\left[ { - 4\, + \,15\{ 5\, \div \,\left( {4\, - \,7} \right)\} \, \div \,\,4\left( { - 5} \right)} \right]}}{{\left( { - 14} \right)\, \times \,\left( 2 \right)\, + \,7}}\) ಅನ್ನು ಸರಳಗೊಳಿಸಿ.
1
\(\frac{7} {20}\)
2
\(-\frac{5} {12}\)
3
\(\frac{7} {12}\)
4
\(3\frac{8} {21}\)