<PRE><B>Question 552428</B>
&lt;br&gt;&lt;font face=&quot;Tahoma&quot;&gt;This one should be fairly simple:&lt;br&gt;

{{{tx-ux=3t}}} given&lt;br&gt;

{{{x(t-u)=3t}}} factored x out of the two terms on the left side&lt;br&gt;

{{{x=(3t)/(t-u)}}} divided both sides by (t-u)&lt;br&gt;

Of course our denominator can NOT equal zero, so:&lt;br&gt;

{{{t-u&lt;&gt;0}}}&lt;br&gt;

In other words {{{t&lt;&gt;u}}}&lt;br&gt;

Other than that, t and u can be any real numbers.&lt;br&gt;

I hope this helps!  :)&lt;br&gt;

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