Как решить вырожение (59937-304752:21-1117•17):12

( 59937 - 304752 ÷ 21 -  1117 × 17 ) ÷ 12 = ( 59937 - 14512 - 18989 ) ÷ 12 = 59903.499 ÷ 12 =4992

1) 304752 ÷ 21 = 14.512 ;

2) 1117 × 17 = 18.989 ;

3) 59937 - 14.512 = 59922.488 ;

4) 59922.488 - 18.989 = 59903.499;

5) 59903.499 ÷ 12 = 4991.9582~4992 .