Since it is 40% OF 45 you have the whole and percent so multiply 45 by 40 then divide by 100 you get 18
First, you expand it.
2x - 6x + 3 = 3 - 4x
Now, simplify.
-4x + 3 = - 4x
Cancel out the double "4x"
3 = 3
Since both side have an equal answer, there in an infinite number of answers.
Hope this helps! ☺♥
Then mark it down by less then 1%, of by whatever the number would be.
