6 is a digit . 2x is a variable. Therefore, you don't have an answer for 6+2x.
You may ask "what is x if 6+2x=12?"
6+2x=12
Subtract 6 from both sides
2x=6
divide both sides by 3
x=2
-2x + 6 + 22 = -2x + 28
6 + 2x + 5 = 11 + 2x
-6 + 4x + (9-2x) = -6 + 4x + 9 - 2x = [ 3 + 2x ]
-2x-6= -2x-6Another answer:-2x-6 = 2x+6-2x-2x = 6+6-4x = 12x = -3
x=1
4x+35-2x+25 = 6 2x+60 = 6 2x = 6-60 2x = -54 x = -27
6 + 2x =2(3 + x)
2x-6
22+2x = 37+6+x 2x-x = 37+6-22 x = 21
2x + 10x - 6 = 12x - 6
2x+x+5+3x-6=6x-1
6 + 2x = 5x + 9 , 6 - 9 = 5x - 2x , -3 = 3x , x = -1