3r – 1 = 7 – (r + 4).

Sure, let's solve the equation step by step:

1. First, simplify the equation by removing the parentheses on the right side. To do this, distribute the negative sign to both terms inside the parentheses:

   3r - 1 = 7 - r - 4

2. Then, combine like terms on the right side:

   3r - 1 = 3 - r

3. Next, add r to both sides to get all the r terms on one side:

   3r + r = 3 + 1

4. This simplifies to:

   4r = 4

5. Finally, divide both sides by 4 to solve for r:

   r = 1

So, the solution to the equation 3r – 1 = 7 – (r + 4) is r = 1.