# Question #de185

##### 1 Answer

See explanation

#### Explanation:

Algebra is exactly like manipulating numbers. The only difference is that you do not know the values of the numbers you are dealing with. You have to show that a number is there somehow so you use a letter in stead.

Suppose we had:

6 + "some number the value of which we do not know"

It is much simpler to write

The thing is, we may have two numbers that we do not know the value of. So we could write:

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can not do much with

Instead, suppose we had:

Suppose I was to

On the left had side we have

On the right hand side we have

so

So now we know that

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Suppose we had

Subtract 4 from both sides

Hope this helps