# How do you simplify expressions 8+(9t+4)?

Here, the bracket of $\left(9 t + 4\right)$ in $8 + \left(9 t + 4\right)$ is redundant as this expression only involves addition.
$8 + \left(9 t + 4\right) = 8 + 9 t + 4 = 12 + 9 t$