Answer
$d\leq2$
Work Step by Step
$\frac{3}{5}+d\leq2\frac{3}{5}\longrightarrow$ Subtract $\frac{3}{5}$ from each side using the subtraction property of equality.
$\frac{3}{5}+d-\frac{3}{5}\leq2\frac{3}{5}-\frac{3}{5}\longrightarrow$ Simplify
$d\leq2$