What is the length of side AC of the triangle? Enter your answers in the boxes. units Triangle A B C with vertical side A C. Vertex B lies to the right of side A C. Angle A and angle C are marked congruent. The length of side A C is labeled as 6 x plus 7. The length of side A B is labeled as 5 x plus 5. The length of side B C is labeled as 7 x minus 1.