Question 662276
<pre>
Uh oh!  The other tutor's answer has a sign wrong.

      y = {{{1/2}}}x - 5

Multiply both sides by 2 to clear of fractions:

     2y = 2{{{1/2}}}x - 10

     2y = x - 10
 +10        + 10
----------------
2y + 10 = x

Swap sides.

      x = 2y + 10 
 
Edwin</pre>