Answer
$\{0.5\}$
Work Step by Step
Subtract $0.1t$ from both sides.
$0.9t-0.1t=0.4+0.1t-0.1t$
Simplify.
$0.8t=0.4$
Divide bot sides by $0.8$.
$\dfrac{0.8t}{0.8}=\dfrac{0.4}{0.8}$
Simplify.
$t=0.5$
Hence, the solution to the equation is $\{0.5\}$.
