I think of a number. I multiply it by 6 and add 3. If my answer is 75, calculate the number I starte

I think of a number. I multiply it by 6 and add 3. If my answer is 75, calculate the number I started with.

Let the number be n.

Multiply it by 6:
6n

Add 3:
6n + 3

If the answer is 75, we set 6n + 3 equal to 75:
6n + 3 = 75

We have an equation. To solve for n, we type this equation into our search engine and get:
n = 12