Question 119767
This is not making sense to me at all. Please help me answer this. I just do  not understand what I am supposed to do here.  Thanks so much for your help.

The problem says solve for m.
{{{D = (m+w)/2}}}    

<pre><font face = "book antiqua" size = 6 color = "indigo"><b> 
Clear of fractions by multiplying by
2 on the left and {{{2/1}}} on the right:

{{{(2)D}}} = {{{(2/1)}}}{{{(m+w)/2}}}

Cancel the 2's on the right:

{{{2D}}} = {{{(cross(2)/1)}}}{{{(m+w)/cross(2)}}}    

{{{2D}}} = {{{m+w}}}

Subtract w from both sides

{{{2D-w}}} = {{{m}}}

or if you prefer:

{{{m}}} = {{{2D-w}}}

Edwin</pre>