Voorbeeld: - 5 - - 7 = - 5 + 7 = 2
a. - 3 – – 8 = ......................... = ...............................
b. 5 + – 7 = .......................... = ...............................
c. –4 + – 4 = .......................... = ...............................
d. –3 – – 5 = .......................... = ...............................