The problem is to simplify the expression $(x+3y-1) + (4x+5)$.

1. Problem Description

The problem is to simplify the expression $(x+3y-1) + (4x+5)$.

2. Solution Steps

First, remove the parentheses:

$x+3y-1+4x+5$

Next, group like terms:

$(x+4x)+3y+(-1+5)$

Combine like terms:

$5x+3y+4$

3. Final Answer

The simplified expression is $5x + 3y + 4$.