How do you solve #3-x=18-4x#?
Method shown in 'over the top' detail so that you can see what is happening. You should then be able to solve others more easily.
The brackets are used to show grouping to help understand what is happening.
Note: add is the same as 'put with'
subtract is the same as 'remove'
To get of something one side of the = sign you do the opposite action. Also, what you do to one side of the = sign you also do to the other. So if something is add (put with) on one side then you have to remove it (subtract) to get rid of it. That action applied to both sides of the = sign effectively moves it from one side to the other. It if it multiply then you have to divide and so on.
To get 'rid of' the
Substituting (3) and (4) into (
which is the same as
Subtract 3 from both sides.
Grouping again as:
Multiply both sides of (6) by