explain how to solve the following equation using mental math?

Question

2x +5 = 4x=8

Answer 1

 It is :

 

  2X + 5 = 4X +8

 

   2X - 4X = 8 -5    / move over variable to one side , and constants to other, change the sign after moving.

 

   -2X = 3

  

    X = -3/2

 

 

Answer 2

Hi Travina;

If I understand correctly, this is NOT...

2x+5=4x=8

But rather...

2x+4=4x=8

Mentally, I can quickly calculate that...

4x=8

x=2

Mentally, I cannot quickly calculate that...

2x+4=8

2x=4

x=2

Mentally, I cannot quickly calculate that...

2x+4=4x

4=2x

2=x