The given statement can be written algebraically as 3(x - 1), where x is the unknown number that is being thought of.
To break it down further:
- "I think of a number" - this can be represented by x
- "Take away 1" - this means subtracting 1 from x, which gives x - 1
- "Multiply the result by 3" - this means multiplying (x - 1) by 3, which gives us 3(x - 1)
Therefore, the algebraic expression for "I think of a number, take away 1 and multiply the result by 3" is 3(x - 1).