Question

infinitely many solutions\\
\\(\frac{2}{5}x + 3 = \frac{2}{5}x + square\\)

Explanation:

Step1: Recall infinite solution condition

A linear equation $ax + b = ax + c$ has infinitely many solutions if $b = c$.

Step2: Match constants in the equation

In $\frac{2}{5}x + 3 = \frac{2}{5}x + \square$, the left constant is 3. For infinite solutions, the right constant must equal 3.

Answer:

$3$