3x - x - 5 = 2x + 4 - 9
First, simplify 3x - x - 5 to 2x - 5. / Your problem should look like: 2x - 5 = 2x + 4 - 9
Second, simplify 2x + 4 - 9 to 2x - 5. / Your problem should look like: 2x - 5 = 2x - 5
Third, since both sides are equal, there are infinite solutions.
Answer: infinite solutions