Solution: the original inequality is equal to

1-2X & gt； 1 1 and 1-2x < 2 1

Solution 1-2x >: 1 1

-2X & gt； 10

X & lt-5

Solution 1-2x

-2X & lt； 20

X & gt- 10

Just remember that when both sides of inequality divide negative numbers together, the direction of inequality changes.