because these triangles share two congruent sides, the third will also be congruent. set the equations equal to each other. 4x + 8 = 7x - 4 then combine like terms -3x = -12 then divide to isolate the x -12/-3 = x 4 = 4 you can then plug it in to both sides to see if it is equal/correct 4(4) + 8 = 7(4) -4 16 + 8 = 28 - 4 24 = 24
