#### Answer

3x - 1 = 2x;
x - 1

#### Work Step by Step

"three times a number" translates to 3x.
"The difference of three times a number and 1" translates to 3x - 1.
"twice the number" translates to 2x.
Therefore, the expression is:
3x - 1 = 2x
Solve for x:
x - 1 = 0
x = 1