{[(107 -63 :x)×9-2]:5+3×9}×4-12=800 |+12
{[(107 -63 :x)×9-2]:5+27}×4=812 |:4
[(107 -63 :x)×9-2]:5+27=203 |-27
[(107 -63 :x)×9-2]:5=176 |×5
(107 -63 :x)×9-2=880 |+2
(107 -63 :x)×9=882 |:9
107 -63 :x=98 Aflam scazatorul (63:x):
63:x=107-98
63:x=9 aflam impartitorul:
x=63:9
x=7