Christina I. answered 12/28/19
Let's start by breaking this down into smaller parts:
"When 12 is subtracted from" in an equation would look like "- 12". We aren't subtracting from 12. That would look like "12 -" Instead, we are taking 12 away from something.
Now, what are we subtracting 12 from? "Twice some number". To represent "some number", we will use 'x'. To get "twice some number" we need to multiply 'x' by 2. This would look like '2x'.
Let's pause right there for a moment to bring these two phrases together. "When 12 is subtracted from twice some number" should look like 2x-12.
What do you think "the result is 6" would look like? That's right! It would be '=6'.
So, your complete equation would be 2x-12 = 6.