Răspuns:
inmultesti termenii pe diagonala
[tex]a.3x=4*9= > x=36:3= > x=12\\\\b.2x=8*7= > x=56:2= > x=28\\\\c.4x=3*8= > x=24:4= > x=6\\\\d.3x=4*9= > x=36:3= > x=12[/tex]