Originally Posted by

**newatthis** Hi could someone please help with this one.

Bascially if you pick any number and then Multiply it by two. Add seven. Multiply by three. Add the number you first thought of. Divide by seven. Multiply by four. Subtract the number you first thought of. Divide by three. Subtract the number you first thought of again.

The answer will always be 4.

If you take x to be the first number you though of, and y to be the result.

How would you write and equation expressing y as a function of the operations on x described above.

Also how would you simplify this equation, which would explain the final result?

Any help on this would be appreciated.