Write the following algebraically, using x as your unknown. I think of a number, multiply it by 2, subtract 3 and multiply the result by 4

4(2x - 3).

Step-by-step explanation:

(x * 2 - 3) * 4

= 4(2x - 3)

(2x - 3)*4

Step-by-step explanation:

"I think of a number" :   OK, I'm thinking of my x

"multiply it by 2" :  Now I have two of them:  2x

"subtract 3":   Here we go:  -3

"multiply the result [ (2x-3)] by 4:  multiply by 4:  *4

Now put them all together:  (2x - 3)*4

[Also:  8x - 12]