Solve the equation \(6x + 9 = -21\) using a complete presentation.
2.
Solve the equation \(4x + 7 = 7\) using a complete presentation.
3.
Solve the equation \(-5t - 27 = -6t\) using a complete presentation.
4.
Work backwards from the given information to derive the original presentation.
\begin{equation*}
\begin{aligned}
\\
\amp \amp \eqnspacer \amp \text{Add $3y$ to both sides} \\
\\
\amp \amp \amp \text{Subtract $6$ from both sides} \\
\\
7 \amp = y \amp \amp \text{Divide both sides by $-2$} \\
\\
y \amp = 7 \amp \amp \text{Rewrite in the conventional order}
\end{aligned}
\end{equation*}
