Fill in the boxes using each digit from 1 to 9 once so that each equation is correct. Note that all operations are performed in order from left to right or top to bottom.

  _     _     _
 |_| x |_| - |_| = 6 

  +     +     +
  _     _     _
 |_| + |_| - |_| = 5 

  -     x     /  
  _     _     _ 
 |_| x |_| / |_| = 3 

  =     =     =
  2     9     4