Thread: 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

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

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!

Originally Posted by earboth

4 = 3x ==> x = 4/3

Dont u mean x = 3/4 ??

Isnt it (3/4) * x ??

Originally Posted by janvdl

Dont u mean x = 3/4 ??

Isnt it (3/4) * x ??

No.

4 = 3x

4/3 = (3x)/3

4/3 = x

-Dan

If only people would use parenthesis...