solve for x

Question

12 + 8x = 4, 8x = 12 - 4, 8x = 8, 8x = 8/8, x = 1 Is this the right answer?

Answer 1

you messed up with your signs

 

remember that your equation really is

 

+12 + 8x = +4

 

so we have to subtract 12 from both sides,

 

+12 - 12 +8x +4 - 12

 

the 12s on the left cancel

 

you get

 

+8x = -8

 

now divide both sides by 8

 

+ 8x / 8 = -8 / 8

 

x = -1