Question 12Fill the lines with '+' and '-' to make the equation correct: 15 __ 4 __ 6 __ 8 = 1315 - 4 + 6 - 8 = 1315 + 4 - 6 - 8 = 1315 - 4 - 6 + 8 = 1315 - 4 - 6 - 8 = 13