Sove simple equation doubt

I'm solving this:

Code:

`3 – 7 * (1 - 2x) = 5 – (x + 9)`

And am trying this way:

Code:

`3- 7 * (1 - 2x) = 5 - (x + 9)`

3 - 7 ..?? ?? = 5 - x - 9)

What should be done in the part I put those question marks?

I'm really lost.

Thanks in advance for any help.

Re: Sove simple equation doubt

Do you know the distributive law?

In general:

Use it to expand

Re: Sove simple equation doubt

Thanks for the reply.

So, I should do:

I'm lost...

Re: Sove simple equation doubt

You have to pay attention with the signs:

Re: Sove simple equation doubt

I was doing:

Code:

`3 - 7 * (1 - 2x) = 5 - (x + 9)`

3 - 7 * 1 - 7 * (-2x) = ...

3 -** (-7)** - 14x = ...

When I should be doing:

Code:

`3 - 7 * (1 - 2x) = 5 - (x + 9)`

3 - 7 * 1 - 7 * (-2x) = ...

3 **- 7** - 14x = ...

Why don't I put -7 inside parentheses?

Re: Sove simple equation doubt

If you expand:

And the LHS is:

If you expand:

Now, the LHS is: