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explain how to solve the following equation using mental math?

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2 Answers

 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
 
 
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