Question

Solve for:

-20 <= 3x - 7 <= -2

The solution is xl __<= x <=__

Answer 1

The <= on the left tells you that

-20 <= 3x - 7
-27<= 3x
-9 <= x

The <= on the right tells you that
3x - 7 <= -2
3x <= 5
x <= 5/3

Therefore

-9 <= x <= 5/3