Question

aflați x din egalitatea {[(107 -63 :x)*9-2]:5+3*9}*4-12=800

Answer 1

{[(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