RT = 36 = 6x + 1 + x + 7 7x + 8 = 36 7x = 36 - 87x = 28x = 28/7 x = 4.RS = 6x + 1 = 6×4 + 1 = 25 .ST = x + 7 = 4 + 7 = 11 .Hope this helps!