4 + x ≥ 0 x ≥ -4 5x = 4 + x 4x = 4 x = 1

4 + x ≤ 0 x ≤ -4 5x = -(4 + x) 5x = -4 - x 6x = -4 x = nesplňuje podmínku x ≤ -4

x = 1