Solve the following equation for $x$: $3xy-4x=2+x$

Acceptable solution:

Solve for $x$: $3xy-4x=2+x$


\begin{displaymath}\begin{array}{ccc} \par 3xy-4x & = & 2+x\\ 3xy-5x & = & 2\\ ... ...)x & = & 2\\ x & = & \fbox {$\frac{2}{(3y-5)}$}\par\end{array}\end{displaymath}

Unacceptable solution:

Solve for $x$: $3xy-4x=2+x$


\begin{displaymath}\begin{array}{cccr} \par 3xy-4x & = & 2+x &\\ 3xy-5x & & &\m... ...e too.)}\\ x & = & \fbox {$\frac{2}{(3y-5)}$}& \par\end{array}\end{displaymath}

(The ``unacceptable solution'' loses track of the right hand side of the equation. It is much harder to follow and much easier to make a mistake.