The red arrows mean the lines are parallel. Since all angles are equal, the larger triangle is similar to the smaller one. Then corresponding sides have the same ratio (4x -2)/9 = (3x+2)/12 x(4/9 -3/12) = (2/12) +(2/9) x = (7/18)/(7/36) = 2 . . . . . . . . . corresponding to the 3rd selection
