#### Answer

$t=-1$

#### Work Step by Step

Using the properties of equality, the solution to the given equation, $
5(3-3t)=30
$, is
\begin{array}{l}
15-15t=30
\\\\
-15t=30-15
\\\\
-15t=15
\\\\
t=\dfrac{15}{-15}
\\\\
t=-1
.\end{array}
CHECKING:
\begin{array}{l}
5(3-3(-1))=30
\\\\
5(3+3)=30
\\\\
5(6)=30
\\\\
30=30
\text{ (TRUE)}
.\end{array}
Hence, the solution is $
t=-1
$.