Answer
$t=-8
$
Work Step by Step
Using the properties of equality, the solution to the given equation, $
-39=1+5t
$, is
\begin{array}{l}
-39-1=5t
\\\\
-40=5t
\\\\
\dfrac{-40}{5}=t
\\\\
t=-8
.\end{array}
Checking:
\begin{array}{l}
-39=1+5(-8)
\\\\
-39=1-40
\\\\
-39=-39
\text{ (TRUE)}
.\end{array}
Hence, the solution is $
t=-8
.$