Question 652563
<pre>
  x + 4 =  9x + 4

Subtract 9x from both sides:

  x + 4 =  9x + 4
-9x       -9x
-----------------
-8x + 4 =       4

Subtract 4 from both sides

-8x + 4 = 4
    - 4  -4
-----------
-8x     = 0

Divide both sides by -8

{{{(-8x)/(-8)}}} = {{{0/(-8)}}}

Cancel the -8's on the left and 0 divided by -8 is 0:

{{{(cross(-8)x)/(cross(-8))}}} = 0

So we end up with just

          x = 0

Edwin</pre>