# Question: 3x-5

## Comment on 3x-5

### Hello,

Hello,

I was able to solve using the approach however I first tried solving using: 2(3x-5)+2(x-15)=360 and got x=50

How come this doesn't work? ### That's the right idea, but

That's the right idea, but you have (x-15), when it should by (x+15)

### Here it is given x+15. x-15

Here it is given x+15. x-15 will give wrong answer.

### Hey Brent, what's your

Hey Brent, what's your opinion on redrawing the figures? Some questions take a bit of time to redraw so there's the downside of losing time, but it seems to help a lot in being able to label various parts of the diagram.

Any rule of thumb for redrawing? ### I think redrawing the figures

I think redrawing the figures is almost always a good idea, especially if there are many missing angles and lengths in the figure. That said, if there's little information that can be added to the diagram, then I wouldn't bother.

For example, if a diagram consists of a right triangle with the lengths of two sides given, and your task is to determine the length of this missing side, then there wouldn't be much value in redrawing the triangle.

Cheers,
Brent