Tìm x ∈ Z:x - { 57 – [ 42 + ( -23 – x )]} = 13 –{47 + [ 25 – ( 32 -x )]}

Tìm x ∈ Z:
x - { 57 – [ 42 + ( -23 – x )]} = 13 –{47 + [ 25 – ( 32 -x )]}