Evaluating  42
42 = 42
Evaluating  2 + 4
2 + 4 = 6
Evaluating  2 + 4 * 3
2 + 4 * 3 = 14
Evaluating  2 + -4
2 + -4 = -2
Evaluating   ( 2 + 4 ) * 3
 ( 2 + 4 ) * 3 = 18
Evaluating   ( 2 + 4 ) * 3 * ( 7 + 3 )
 ( 2 + 4 ) * 3 * ( 7 + 3 )  = 180
Evaluating   ( 2 + 4 * ( 3 + 3 ) ) * 3 * ( 7 + 3 )
 ( 2 + 4 * ( 3 + 3 ) ) * 3 * ( 7 + 3 )  = 780
Evaluating  Power[ ( 3 + 4 ) ,2 ]
Power[ ( 3 + 4 ) ,2 ] = 49
Evaluating  2 * Power[ ( 3 + 4 ) ,2 ]
2 * Power[ ( 3 + 4 ) ,2 ] = 98
Evaluating  Power[ ( 3 + 4 ) ,2 ] * 2
Power[ ( 3 + 4 ) ,2 ] * 2 = 98
Evaluating  Power[ 7,2 ] * 3
Power[ 7,2 ] * 3 = 147
Evaluating  Power[ 7,3 ]
Power[ 7,3 ] = 343
Evaluating  Power[ Power[ 2,2 ] ,4 ]
Power[ Power[ 2,2 ] ,4 ] = 256
Evaluating  ((3+4)*5)/2
((3+4)*5)/2 = 17.5
Evaluating  (2*(2+4))
(2*(2+4)) = 12