5 + 12 * (10 - 4) ;
5 + 12 * (10 - 4) - (8 / 4 / 2) ;
2.25 * 3.0 + 1.25;
64/8/2;
-12 - -7 ;

-12--7;
12 + 4 * 5 + 7 * 21 - 4 / 2 - 8 - 2 + 5 * 3
   + ( 2 * 2 * 2 * 2 * 2 ) * ( 3 + 3 + 3 + 3 ) ;

-7. + -.4;

5 3 7 + / - 4 ;
5 + 3 / 7 - 4 ;

5
+
7
*
2
+
8
;

2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2+2 ;
2+(2+(2+(2+(2+(2+(2+(2+(2+(2+(2+(2+(2+(2+(2+(2+(2+(2+(2+
  (2+(2+(2+(2+(2+(2+(2+(2+2)))))))))))))))))))))))))) ;
2*(2+(2+(2*(2+(2+(2*(2+(2+(2*(2+(2+(2*(2+(2+(2*(2*(2*(2*
  (2+(2+(2*(2*(2*(2*(2*(2+2)))))))))))))))))))))))))) ;
#
2 + 3 * 4 ;