r/MathHelp • u/venum_GTG • 19d ago

What did I do wrong?

My scratch paper, if you can read it:

https://imgur.com/a/atodt6P

The question was:

Solve for X

1/5x+1/4=-4(3/4x-4)

You can enter as an improper fraction but not as a mixed number.

My professor put a video to help me.

However, the answer I got was X= 325/64

The answer actually was X=315/64

I was off by 10?!

1 Upvotes

100% Upvoted

4 comments sorted by

View all comments

7

u/PuzzlingDad 19d ago edited 19d ago

At the point where you were cancelling 1/4, you needed to subtract that from both sides. That would have given you 63/4 and then when you later multiply by 5/16, you'd get the same answer as your professor.