Three-part inequalities have two symbols in their expressions.
Solving a three part inequality is the same as two part inequalities. As in:
What you do to one side – You must do to the other.
Except now you do it to all three sides.
So try to get `x` on its own
Add 1 to all three sides
Divide all 3 sides by 2
Answer: `-1.5` is less than or equal to `x` and `x` is less than or equal to `3`.