Explicație pas cu pas:
x^2 - 2x + x - 2 <=3x+1
x^2 - x - 2 - 3x - 3<= 0
x^2 - 4x -5 <= 0
x^2 - 5x + x - 5 <= 0
x(x-5) + (x-5) <= 0
(x-5) ( x+1) <= 0
x - 1. 5.
x-5. - - - - 0 ++++
x+1 - -1 +++++++
(x-5)(x-1) + 0 - 0 +
x aparține [-1,5]
x = - 1,0,1,2,3,4,5
Suma = - 1 + 0 + 1 + 2 + 3 + 4 + 5 = 14
