# Brain Teaser

• May 6th 2007, 05:15 PM
Megpup
Brain Teaser
What is the value of 3-4/3x + 5 =7

-4 + 3=x +4

3-4= -x+6+11x+4x-3

-3 1/3x - 1/6= 1 1/3
• May 6th 2007, 05:42 PM
topsquark
Quote:

Originally Posted by Megpup
What is the value of 3-4/3x + 5 =7

-4 + 3=x +4

3-4= -x+6+11x+4x-3

-3 1/3x - 1/6= 1 1/3

Can I be the first to say

What???

Are you trying to solve:
3 - 4/(3x + 5) =7

-4/(3x + 5) =4

-4 = 4(3x + 5)

-1 = 3x + 5

3x = -1 - 5 = -6

x = -2

-Dan
• May 7th 2007, 06:21 AM
earboth
Quote:

Originally Posted by Megpup
What is the value of 3-4/3x + 5 =7

-4 + 3=x +4
3-4= -x+6+11x+4x-3
-3 1/3x - 1/6= 1 1/3

Hi,

I assume that you want to solve
Code:

```      4 3 - ---- + 5 = 7     3x```
You'll get:
Code:

```      4 8 - ---- = 7     3x```
Subtract 8 on both sides:
Code:

```  4 - ---- = -1   3x```
Multiply by (-3x):

4 = 3x ==> x = 4/3. I really don't understand what you have done - honestly!
• May 7th 2007, 09:49 AM
janvdl
Quote:

Originally Posted by earboth
4 = 3x ==> x = 4/3

Dont u mean x = 3/4 ?? :confused:

Isnt it (3/4) * x ??
• May 7th 2007, 09:59 AM
topsquark
Quote:

Originally Posted by janvdl
Dont u mean x = 3/4 ?? :confused:

Isnt it (3/4) * x ??

No.

4 = 3x

4/3 = (3x)/3

4/3 = x

-Dan
• May 7th 2007, 10:01 AM
janvdl
If only people would use parenthesis... :mad: