Răspuns :
x +20 - 5 + 8 = 88
x +20 - 5 = 88 - 8
x +20 - 5 = 80
x +20 = 80 +5
x+20 = 85
x = 85 - 20
x = 65.
x +20 - 5 = 88 - 8
x +20 - 5 = 80
x +20 = 80 +5
x+20 = 85
x = 85 - 20
x = 65.