Răspuns :
a + b = ( - 12 )
a - b = 2
a = 2 + b
2 + b + b = ( - 12 )
2 + 2 × b = ( - 12 )
2 × b = ( - 12 ) - 2
2 × b = - 14
b = ( - 14 ) : 2
b = - 7
a = 2 + ( - 7 )
a = - 5
a - b = 2
a = 2 + b
2 + b + b = ( - 12 )
2 + 2 × b = ( - 12 )
2 × b = ( - 12 ) - 2
2 × b = - 14
b = ( - 14 ) : 2
b = - 7
a = 2 + ( - 7 )
a = - 5