Verified answer

bjr

 ( 1/5) + x ≤ 1

x ≤ 1 - (1/5)

x ≤ (5/5) - (1/5)

x ≤ 4/5

S = ]-inf ; 4/5]

bjr

x + 1/5 ≤ 1

x ≤ 1-1/5

x ≤ 4/5

bonne journée

x appartient à ] - infini ; 4/5 ]