Subtracting 4, we get - 3 - 4 ≤ 4 -

7x

2

- 4 ≤ 18 - 4 or - 7 ≤

−7x

2

≤ 14
Multiplying each side by −

2

7

, we get
- 7 × (−

2

7

) ≥ −

7

2

x × (−

1

7

) ≥ 14 × (−

2

7

)
2 ≥ x ≥ – 4 or –4 ≤ x ≤ 2
∴ x is less than or equal to 2 and greater than or equal to –4. i.e., x ∈ [– 4, 2]