Question 64029
<pre><font size = 5><b>2z + x = 11.5

You didn't tell us what to do with it.  Always give
the instructions when you post a problem, so we will 
know what to do with it.

Were the instructions "Solve for x"?  If so then

2z + x = 11.5

Subtract 2z from both sides:

     x = 11.5 - 2z

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Were the instructions "Solve for z"? If so then

2z + x = 11.5

Subtract x from both sides:

    2z = 11.5 - x

Divide both sides by 2

    2z     11.5 - x
   ---- = -----------
     2         2

    1
    <s>2</s>z     11.5 - x
   ---- = -----------
     <s>2</s>         2
     1 

           11.5 - x
      z = -----------
               2

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Were the instruction "Graph the equation"?  If so,
   z
{{{ graph( 300, 180, -3, 13, -3, 7, (11.5-x)/2) }}}


Edwin</pre>