<PRE><B>Question 383897</B>
20s + 4 = 13s - 10&lt;br&gt;

What you want to do is isolate the variable on one side, and get the numbers on the other. In order to do this, subtract 13s from both sides.&lt;br&gt;

7s + 4 = -10&lt;br&gt;

Now you should subtract 4 from both sides.&lt;br&gt;

7s = -14&lt;br&gt;

Divide both sides by 7 to get rid of the &quot;7&quot; in &quot;7s&quot;&lt;br&gt;

s = -2&lt;br&gt;</PRE>