2/7+3/142/7+3/142/7+3/147.5−13.57.5-13.57.5−13.5 = 4/14+3/144/14 + 3/144/14+3/147.5−13.57.5-13.57.5−13.5 = 7/147/147/147.5−13.57.5-13.57.5−13.5 = 0.50.50.57.5−13.57.5-13.57.5−13.5 = 0.5*−6-6−6 = -3.
2/7+3/142/7+3/142/7+3/147.5−13.57.5-13.57.5−13.5 = 4/14+3/144/14 + 3/144/14+3/147.5−13.57.5-13.57.5−13.5 = 7/147/147/147.5−13.57.5-13.57.5−13.5 = 0.50.50.57.5−13.57.5-13.57.5−13.5 = 0.5*−6-6−6 = -3.