Problem:
Using Maple, solve the inequality

|x - 7| < 9


Visualization:
The command to use is solve. For example, to solve the inequality

|x - 7| < 9

we type:

> solve( abs(x-7) < 9, x);

and Maple responds with

RealRange(Open(-2),Open(16)).

In usual notation, this would be the interval (-2, 16).

As another example, type:

> solve(x/(2-x)<=4, x);

and Maple responds with

RealRange(-infinity,8/5), RealRange(Open(2),infinity) .

In usual notation, this is the union