x + 2 ≥\geq≥ 2x + 1
x - 2x ≥\geq≥ 1 - 2
-x ≥\geq≥ -1
−x−1\;\frac{-x}{-1}−1−x ≥\geq≥ −1−1\;\frac{-1}{-1}−1−1
x ≤\leq≤ 1
