\({2 \over 9} + {5 \over { - 12}} - {{ - 3} \over 9} = {2 \over 9} + {{ - 5} \over {12}} + {3 \over 4} \)
\(= {{2.4} \over {36}} + {{\left( { - 5} \right).3} \over {36}} + {{3.9} \over {36}} \)
\(= {{8 - 15 + 27} \over {36}} \)
\(= {{20} \over {36}} \)
\(= {5 \over 9}\)
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